[I'm guessing] I think the attempt is to move as many sites as possible to subcategories, that's why it says in the cat descripion "Submission to the proper category will speed up the review..."
Editors often do quick looks at sites to help resort them into subcategories. Having the word trail all over the site together with all the picture of bikes probably contributed to the move, but I assume when it was fully reviewed, it would not end up in that category.
So, as said, choosing your own best sub-category in the first place, helps to avoid that delay.