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WDBackup says Passport Ultra is Full, but Windows says 750GB Free

I’ve only done 2 backups previously on my 1TB Passport Ultra, my whole Laptop is no more than about 125GB, but now WD Backup says it cannot perform backup as my passport Ultra is Full.
According to Windows I have over 750 GB free?
I’ve tried uninstalling the WDBackup software and re-installing, but still with same Issue.
If I copy and Paste files on to my Drive using Windows they copy fine.
I’ve removed all Security on the Drive.
Short of Reformatting and Starting again, are there any suggestions?

Is this the only external drive connected to the PC?

It’s the only one connected via USB. It is connected to.a network storage but that’s the same as it always has been and I don’t run any backup utilities to that one.

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