Hello Wyandottest,
Thank you for reaching out to Apple Support Communities.
Let's turn off iCloud Keychain on both your devices. Restart them, and turn it back on. This should help it sync:
"Turn on iCloud Keychain on your iPhone, iPad, or iPod touch
- Tap Settings, tap [your name], then choose iCloud.
- Tap Passwords and Keychain.*
- Turn on iCloud Keychain. You might be asked for your passcode or Apple ID password.

Find your saved passwords and passkeys on your iPhone or iPad"
More details can be found here: Set up iCloud Keychain
If the issue persist, can you provide a few more details? Which iOS and macOS versions are you currently using? When did you firs notice this? Also, is everything else syncing to iCloud without any issues?
Cheers!