Its an existing problem but if you go to kit pvp (city is the only map I play) city and get a horse kit, if you ride around the map and pick up other loot from the ground and you happen to get per say a golden sword or a bow or an iron sword, if you open your inventory and left click on that item, you get that kit and its armor and everything else in your inventory is cleared. The problem is, if you find a potion on the ground (unused), you can click on that and get the full potion kit an infinite number of times as long as you keep one unused potion in your inventory to click on.