one choice not working and another choice being activated twice per use?

[dusk]

this is the one that is happening twice/three times when you type the choice once

if (choice == 'st' || choice == 'ST')
    {
     SheildTackle = (rand() % 25) + 1;
     hitpoints = (hitpoints - SheildTackle);
     cout << "You hit a " << SheildTackle << endl;
     cout << "A Bloodfly has " << hitpoints << "hitpoints left.\n";

     hit = (rand() % 20) + 1;
     life = (life - hit);
     cout << "A Bloodfly his " << hit << endl;
     cout << "You have " << life << "hitpoints left.\n";
    }

for those of you wondering, i managed to fix it, and it really was a nub move xD for some reason using multiple letters for a choice such as QQ qq oo etc will cause it to pick the choice twice? and 3 letters = picks the choice 3 times? so i made my st choice into t and my usep one into p and it just works now

this is the one that just acts as if its not there

if (choice == 'st' || choice == 'ST')
    {
     SheildTackle = (rand() % 25) + 1;
     hitpoints = (hitpoints - SheildTackle);
     cout << "You hit a " << SheildTackle << endl;
     cout << "A Bloodfly has " << hitpoints << "hitpoints left.\n";

     hit = (rand() % 20) + 1;
     life = (life - hit);
     cout << "A Bloodfly his " << hit << endl;
     cout << "You have " << life << "hitpoints left.\n";
    }

and here the whole script

#include <iostream>
#include <ctime>
#include <cstdlib>
#include <string>


using namespace std;

int main()
{
    const int MAX_ITEMS = 5;
    string setup[MAX_ITEMS];

    int items = 0;

    setup[items++] = "Dagger";
    setup[items++] = "Sheild";
    setup[items++] = "Leather Hide Curiass";

    srand(time(0));
    int pot = 5;
    int slash = rand();
    int SheildTackle = rand();
    int lunge = rand();
    int hit = rand();
    char choice;
    int hitpoints = 100;
    int life = 100;

    cout << "\t\@@@  @@@ @@@@@@@  @@@@@@@@ @@@  @@@ @@@@@@@  @@@@@@  @@@@@@@  @@@  @@@ \n";
    cout << "\t\@@!  !@@ @@!  @@@ @@!      @@!@!@@@   @!!   @@!  @@@ @@!  @@@ @@!  !@@ \n";
    cout << "\t\@!@@!@!  @!@!!@!  @!!!:!   @!@@!!@!   @!!   @!@!@!@! @!@!!@!  @!@@!@!  \n";
    cout << "\t\!!: :!!  !!: :!!  !!:      !!:  !!!   !!:   !!:  !!! !!: :!!  !!: :!!  \n";
    cout << "\t\ :   :::  :   : : : :: ::  ::    :     :     :   : :  :   : :  :   ::: \n\n";
    cout << "\t\  @@@@@@  @@@@@@@  @@@@@@@@ @@@  @@@  @@@@@@ \n";
    cout << "\t\ @@!  @@@ @@!  @@@ @@!      @@!@!@@@ @@!  @@@\n";
    cout << "\t\ @!@!@!@! @!@!!@!  @!!!:!   @!@@!!@! @!@!@!@!\n";
    cout << "\t\ !!:  !!! !!: :!!  !!:      !!:  !!! !!:  !!!\n";
    cout << "\t\  :   : :  :   : : : :: ::: ::    :   :   : :\n\n";
    cout << "\n\nIn this mini game you will be pitted against various monsters";
    cout << " from krentark.\n";
    cout << "can you survive?\n";

    cout << "You Currently have:\n";
    for(int i = 0; i < items; ++i)
    cout << setup[i] << endl;

    cout << "\nYour first fight is against A Bloodfly.\n";

    cout << "When you fight you have to select one of three moves.\n";
    cout << "Slash, SheildTackle, Lunge.\n";

    cout << "\nA Bloodfly: Bzzzzzzz\n";

    char again;
    while(again == 'n' || again || 'N')
    {
    cout << "What would you like to do?\n";
    cout << "Slash (s) SheildTackle (st) Lunge (l): ";
    cin >> choice;

    if (choice == 's'|| choice == 'S')
    {
     slash = (rand() % 30) + 1;
     hitpoints = (hitpoints - slash);
     cout << "You hit a " << slash << endl;
     cout << "A Bloodfly has " << hitpoints << "hitpoints left.\n";

     hit = (rand() % 25) + 1;
     life = (life - hit);
     cout << "A Bloodfly his " << hit << endl;
     cout << "You have " << life << "hitpoints left.\n";
    }

    if (choice == 'st' || choice == 'ST')
    {
     SheildTackle = (rand() % 25) + 1;
     hitpoints = (hitpoints - SheildTackle);
     cout << "You hit a " << SheildTackle << endl;
     cout << "A Bloodfly has " << hitpoints << "hitpoints left.\n";

     hit = (rand() % 20) + 1;
     life = (life - hit);
     cout << "A Bloodfly his " << hit << endl;
     cout << "You have " << life << "hitpoints left.\n";
    }

    if (choice == 'l' || choice == 'L')
    {
     lunge = (rand() % 20) + 1;
     hitpoints = (hitpoints - lunge);
     cout << "You hit a " << lunge << endl;
     cout << "A Bloodfly has " << hitpoints << "hitpoints left.\n";

     hit = (rand() % 25) + 1;
     life = (life - hit);
     cout << "A Bloodfly his " << hit << endl;
     cout << "You have " << life << "hitpoints left.\n";
    }

        if (choice == 'upot')
        {
        if ( pot > 0 )
        {pot = (pot - 1);
        life = (life + 20);
        cout << "you not have" << pot << "left\n";
        cout << "Your health is now" << life << "\n" ;}
        else if (pot = 0)
        {cout << "you do not have enough pot\n";}
        }

    // Declaring Winner
    char weapon;
    if (hitpoints <= 0)
    {
     cout << "You defeated A Bloodfly\n";
     cout << "When you take a weapon, sometimes it may replace";
     cout << " a weapon you already have.\n";

     cout << "Would you like a Rapier (r) Iron Shield (i) Potion(p)\n";
     cin >> weapon;
    // Selecting Weapon
     if (weapon == 'r' || weapon == 'R') // Rapier
     {
      cout << "You've choosen the Rapier.";
      cout << "Your inventory is now:\n";
      setup[0] = "Rapier";
      for (int i = 0; i < items; ++i)
      cout << setup[i] << endl;
     }

     if (weapon == 'i' || weapon == 'I') // Iron Shield
     {
      cout << "You've choosen an Iron Shield.";
      cout << "Your inventory is now:\n";
      setup[1] = "Iron Shield";
      for (int i = 0; i < items; ++i)
      cout << setup[i] << endl;
     }

     if ( weapon == 'p' || weapon == 'P')
     {
      cout << "You've choosen a Poiton";
      cout << "Your inventory is now:\n";
      setup[items++] = "Potion";
      for (int i = 0; i < items; ++i)
      cout << setup[i] << endl;
     }

     cout << "Would you like to continue the battle!<Y/N>";
     cin >> choice;
     if (choice == 'y'|| choice == 'Y')
     
     if (life <= 0)
    {
    cout << "A Bloodfly has defeated you.";
    cout << "You have died";
    return 0;
    }
    }
}
    cout << "Thanks for playing.\n";

    return 0;
}
    }
}
     

Please note: i know the potion reward part after killing a bloodfly is useless, i havent set that up yet, also i know theres no N option yet, im adding that, the only fixes i need are for the ones i mentioned,

ps i put this in the beginners section because i only started coding yesterday and knowing me its probablly something very small i dont see