Tried hooking this up today and no luck

Seems to be giving the sub a signal (which has the 2 rear outputs from the amp bridged) but not giving the front speakers anything.
No idea if I am setting the amp up wrong or a head unit issue? I tried switching the pre out on the amp to rear etc, changing settings, but nothing seems to make the amp give the front speakers a signal.

The Pioneer site says the RCA Pre out is for Rear and Subwoofer. I thought the signal being sent out would be the same though as a Front RCA would?