Just kinda' thinking out loud. Eddie what if you tried using the audio as a loop.

Both Band-in-a-Box and RealBand lets you highlight part of an audio track then save the highlighted audio as a loop. Save the audio as a one or two bar loop. Then you can import the loop and let the program automatically adjust the loop to line up with the bars.

I suspect two things. First there maybe some discrepancy between the computer motherboard timing circuits. Second I suspect Band-in-a-Box and RealBand may increase the discrepancy by the way both programs approach counting time to split it into bars. In other words, everything has plus and minus tolerances so you may have a situation where one motherboard is close to the maximum side of allowable timing tolerance while the second motherboard is close to the minimum side of allowable timing tolerance. Then if the programs mess with timing then timing goes outside tolerance enough to be noticeable.

Jim Fogle - 2024 BiaB (1111) RB (5) Ultra+ PAK
DAWs: Cakewalk by BandLab (CbB) - Standalone: Zoom MRS-8
Laptop: i3 Win 10, 8GB ram 500GB HDD
Desktop: i7 Win 11, 12GB ram 256GB SSD, 4 TB HDD
Music at: https://fogle622.wix.com/fogle622-audio-home