Hello Christina_Rccma,
We woul.d like to see how we can help you with your Messages not sycing as expected. If you restart the Mac, does the issue return? Check your settings against those in this link to confirm everything is set up correctly: Set up iCloud for Messages on all your devices - Apple Support
"Set up iCloud for Messages on your Mac
- In the Messages app on your Mac, do one of the following:
- macOS Ventura: Choose Messages > Settings, click iMessage, then select Enable Messages in iCloud.
- macOS 12 or earlier: Choose Messages > Preferences, click iMessage, then select Enable Messages in iCloud.
2.Select which email addresses and phone numbers you want to send and receive messages from on your Mac.
Any messages currently stored in iCloud are now accessible on your Mac, and any new messages you receive on your Mac will be stored in iCloud.
Note: If you want to see SMS and MMS messages on your Mac, see the Apple Support article Forward SMS/MMS text messages from your iPhone to your Mac or iPad.
3.To see Messages stored in iCloud, open the Messages app.
Note: If you want to turn off Messages in iCloud on your Mac, deselect Enable Messages in iCloud. You can choose to disable Messages in iCloud for all your devices, or just your Mac."
Cheers!