Hello,
im not sure what has happened to my bells. i have 6 plants on only one of the plants the bell pepps are turning mushy brown AS IF I LEFFT THEM ON THE KITCHEN COUNTER. They are small not even fully ripe yet. Do you know what happened? My other bells dont have this.

On the info you've provided they could be affected by a few things including blossom end rot, fruit fly srike or a fungal disease. I'd be inclined to uproot and discard the affected plant. It may spread otherwise.