In a lot of cases yes. The polls generally suck and should be taken with a grain of salt, especially early in the season.
Happens in FBS too. This week No.1 Ohio St went on the road, lost by 1 point at No. 4 Texas and dropped 5 spots. They fell behind Texas (fine) and four teams who either played mid tier FBS Group of 5 teams or FCS teams. Because beating the crap out of some overmatched team is somehow better than playing an actual good team.