User blog:Inconsistible/some sort of bug???

i'm on desktop ROBLOX, there's something wrong with sorting my inventory ingame.

watch this gif: (link below) i try putting the radio (slot 4) to replace where the knife is (slot 2). instead of replacing the knife, nothing happens, and it goes back to its original slot.

gif: https://gyazo.com/47c5a916d5d17fc6def0fa0073932a9e

does anyone know why this happens or how i can fix it?