Vocabulary error: 叁

I have the word 三 in my vocabulary list twice, for some reason, I assume from two different lessons.

They both work fine in Traditional mode, but when I change to Simplified, they both show up with the character 叁.

Looking it up, it does look like this is an alternate number three, but it doesn't make sense to have it on the generic \"three\" card and only in the simplified side.