In Progress Expand Bug

Very sorry to the mods but this issue is nearly impossible to replicate so Ive yet to even make a theory to its cause. So it seems that when the bottom expand button is used so far as I know be it after/before the one next to Anime In Progress or simply twice when a certain condition is met undiscovered the manga list creates dupes. I havent seen this in any forums so far probably due to it being near impossible to get this error especially with how few anilisters add manga to their lists and I doubt very many will ever come across it. Just putting this out their in case the cause is related to the similar cookie bugs