Importing track archives not working properly.

I was working on a sound edit for a film, and one scene needed a lot of work so I put it in its own Cubase (10) project. I exported the tracks, and when I imported the archive into my main project, the timing was wrong. Not only was everything a couple of seconds out, but there were short gaps between some clips.

I never had a problem with Cubase 9, although I was using Windows, while my current project is on a Mac. I don’t know if that’s relevant. I didn’t use 9.5.

Probably the two projects have different tempo (BPM) settings.