With BIAB stopped, Open the Audio Editor. You should be see your audio track and can see if the first bar and the audio are synced. If they are not. set your cursor to the beginning of where the recorded audio should begin at bar 1. Right click and select Mark this point as Bar One. Start Play and the audio and backing tracks should be synced. If they aren't, reselect the starting point again. If they audio and backing track are synced, Right Click and select Permanently apply Bar 1 offset to track. This is the process to sync imported audio and it may be the lead in bars are causing sync problems when you are recording. Hope it helps.

BIAB Ultra Pak+ 2024:RB 2024, Latest builds: Dell Optiplex 7040 Desktop; Windows-10-64 bit, Intel Core i7-6700 3.4GHz CPU and 16 GB Ram Memory.