just realized my leftovers item so now disappered not on my pokemon anymore but lucky I got my fire cell I had take it off on my Fire grass budew so I do not know where my leftover went because I just had caught a female pokemon Adorabull to evolve to miltank when I caught it I forgot to check...
This just happened my Arenay's fire cell item went to my Rowlet and my Rowlet Leftovers went to my Larvitar I don't know why the items jump or passing to each other its so wierd bug hopefully that does get fixed
check if one of your other pokemon holding it because that what happens to it it passes or you might have give it to other pokemon of yours let you know because it happened to me once and I figure how to not to lose it just take it back from other pokemon and put it back to arenay