I have a problem with my rings printing. I use B9 creator 1.2, cherry/red 1:1, 30xy x 50z. I print the same ring (same file), and the ring prongs on the upper side come out thinner than the same ring prongs on the bottom side of the build table. You can see that difference on the picture. I have calibrated my projector and built table a few times, changed two VAT's, but it didn't help. Any idea why it keep happening?