I have it at bottom right on 2nd screen and if I close it and reopen it, it appears where it should.
When Windows starts up however, it's always on thr bottom right of the main monitor, so I have to move it.
Is it some sort of Windows not having fully initialised other monitors by the time the problematic app loads issue?
It would be nice in M$ fixed multi monitor ssues [] but can CF be tweaked to fix this?
ie is the CM windows where it should be? No - put it there!

I notice that sometimes even when logged in and the 2nd screen is up, the clipboard manager isn't showing as it's supposed to and has to be manually launched. Even then it goes to primary monitor not secondary as per OP, even though "Open clipboard manager at last location" is enabled.
Worth a second look.

Log attached

Time 2;55

Let's try that again! Enabled L1 logging.
12:40 - exited CB Fusion, restarted. No CB Manager appeared. Opened it. Appeared on monitor 2 then jumped to monitor 1.
Log attached.