Double appearance of characters in traditional and simplified lists

I think I stumbled upon some – admittedly rather minor – bug.

My study includes simplified as well as traditional characters. Traditional characters or compound words including a traditional character will have a little ‘trad’ note in the upper left corner, otherwise the word is marked as ‘simp’. If there is a word, that has no simplified form, there’ll be no marking whatsoever.
Sometimes, since a couple of days, I’ll come across a word, that even though it has no simplified form, it’ll show up in both lists. This happened with 内科, for example.
This doesn’t really hinder my study flow, it’s more like a curious nuisance :stuck_out_tongue: