Is corrupt glitched???

So I basically traded for corrupt and claimed the item. But it wasn’t in my inventory so I started to freak out. But then the trader said to rejoin so I did and the corrupt was in my inventory like normal. He explained that it happened for him too, and that some of the corrupts do that… Now it works perfectly normal and I can equip it. But im just curious if this is normal for people to have this happen??