Why cant I open backup bundle in timecapsule. Its is backing up with no information other than the last time it backed up

What operating system is running on the Mac?

Do any error messages appear when you try to open the backupbundle?

If yes, what are they?

Not sure why you are trying to open the backupbundle, but that might be another discussion.

I don' have a Mac running Catalina here to test, so not much help there.

Is the backup file really named "Harland's iMac.sparset"?

Time Capsule backup files are normally named ".sparsebundle" or ."backupbundle"

If you right-click on "Harland's iMac.sparset" and look for Open With, what application is displayed?