I've noticed this both on my "pilot" ZCM 10.3.1 and my beta ZCM 11 setups

Right-click on the ZAA, select Properties

Click the Inventory thingy on the left-hand side.

It'll show Last Scan, Next Scan, and Last Upload

Is there any particular reason why the Last Upload is like days older than the Last Scan?

Does ZCM not upload the scan results immediately after the scan completes?

I didn't see a ZCC configuration option for the uploading interval (scan interval, yes).