Are you speaking about it selling the potions that it finds?
You need to enable it to keep them in the bot, if you're using ItemList, you need to activate them in the ItemList itself.
If it's removing the one your character normally uses during play, it shouldnt be "deleting" them. However, you can use "Protected Bag Slots" in the settings > Bot menu of Demonbuddy if that's what is happening.