Are you using the old Engine v1.5 or the new Engine Prime software?
If you are using the new Engine Prime software, is MCX8000 compatibility turned on? Are you explicitly pressing the “Export MCX8000” button?
Can you try re-analyzing and re-exporting the tracks (don’t forget to delete all “*.DDJMEMO” files).
I don’t have the 8000 anymore but if I recall correctly, the only times BPM didn’t show up for me was when the tracks were not analysed/exported through software and I had to find them via the folder structure.
Edit: I also found this which might be worth a look Mcx8000 not showing bpm