An abundance of salt in the rub sitting overnight could cause the ribs to slightly taste like ham, especially if the ribs were enhanced. If you ribs were enhanced they already contained a salt solution which they were already sitting in, putting you half-way to being "hammy".
I find that sometimes people who have not had true smoked meats often associate the smoke flavor with a ham taste. Doesn't mean they actually tasted like ham, maybe they did, maybe they didn't.
Only you can judge if they tasted like ham, or if they tasted like slow smoked pork ribs.
I always let the rub sit overnight in the refrigerator and have never experienced "hammy" ribs. I use OakRidge BBQ Rubs which are much lower in salt and sugar content.
Humphrey's DownEast Beast W/BBQ Guru