I installed a half dozen frames with 3/4" wax starter strips a while back ( placed throughout other frames in 3 supers) and looked in today (been away for 2 weeks). They were all built out completely, top to bottom but not filled yet. The cells seem rather large?

I thought the bees would build smaller cells but these - haven't had time to measure them - look like drone cells almost. All 6 frames look like this. Any explanation?