How are you exporting out of Avid?
Did you make sure that all tracks are on?
Try a Video Mixdown, and place it back on the timeline to see if that works.
Test with little edits of course.
Also, try using the same project you ingested into Resolve as the AAF import project.
Hoping that should link all files.
Unless you imported different files within Avid but they too should move over.