I don't think so. I'm not familiar with the Pioneer, but on my Yamaha bi-amping requires using using the rear surround posts for front bi-amping. I imagine the Pioneer is similar, you use one of the rear output, or heights, and configure them for front bi-amping in your setup menu. So what probably was happening was 1/2 your front speaker was getting the height, or rear, track. That's why it sounded funny. You should be fine.