Either there's a bug in their software or I must have just misclicked for my 2nd guess. Because based on what I thought I guessed, it should have been 3 purple
Spoilers
Because I had solved what the yellow category was, but had 5 entries in it, as well as knowing what was in blue and green. So I intended to answer with the 3 left over + one from the 5 "pristine condition" answers. And when I didn't get a "One away" notice I then started to completely rethink what I had.