A bug probably!
My file got deleted instantly after upload. I know when the common files get deleted due to the checking, but in this case the file was rared by me, renamed & made of custom size! It couldn't have been reported before I shared either!! So I can only assume that it would be a bug!
FYI, the process was such-
A 4.37 GB blu-ray was rared by me in 499mb parts with a very different custom name. I ftped the whole set. When I wanted to share the files part01, par02 & part03 was found deleted inside the deleted folder! All other file parts were intact