Trouble syncing notes between iPhone and MacBook

If I create a new note or add to an existing note on my MacBook, it will show up on my phone, but anything I create or edit on my phone doesn't show up on my MacBook. I've double-checked and they are both connected to the same iCloud (my iCloud is full, if that makes a difference-- I have the free 5GB, but it has been full for years and I have't had issues syncing in the past) and the notes giving me trouble are all created under the "iCloud" banner, as opposed to Gmail or the like.

The only workaround I have managed is opening the iPhone note I want synced near my computer, and when the little iPhone notes bubble pops up on the dock, I click it, and it updates that same note on my Mac. Interestingly enough, it doesn't change the date to the iPhone's most recent edit, but keeps the same date as when I last edited it on the Mac.

What I haven't done is delete and reinstall my iCloud because it just seems like a pain (plus I don't want to lose things), so I was wondering if there are any other methods I should try/settings I should look for. Anyone have any advice to save me from this frustration?