Yes that is a large disparity. But 10 of the FT were in the last minute while you were intentionally fouling. Even after that there is still a large difference, but not as extreme.
You are starting 4 FR and a SO in a press defense, you will be very erratic until they mature. Plus both bigmen having 2 SPD playing press. Add in the fact, that you left it at uptempo, and that explains a lot of it.