AV Drum loop clipping at the start of the file

Have a video with a drum loop, but the opening kick drum isn’t playing/getting cut off.

When I play the file in Finder, the kick is there. The file loops in a different AV playback software. When I bring it into VDMX, the opening kick drum is lost immediately (not just on the loop).

VDMX says it’s at the start of the file so there’s nothing to adjust at the I/O.

Tried HAP and Apple Pro Res format. Same problems.

Any ideas what could be causing this or possible work around for a seamless loop?

Can you share the file with us?