Tempo varies with multi-computer recordings?

In making multitrack recordings from one media player on one computer a second recording on the second computer created a faster tempo and shorter track length when loaded into mixer. Sound quality is great, and the result is both weird and wonderful, but not amenable to conjoint use with the recording from computer one.

Never saw that before.

I decided its easiest to use each Cantabile recorder and transfer the second file back for mixing.

Seemed rational to me, and this is what I get. NO COMPLAINT- totally curious what others might have found trying such tricks.