Ok after some playing around, I thought I found a makeshift solution and I thought it would work beautifully but all I found was a really annoying/tedious workaround. (I'm using Apple Notes on Google Chrome Windows 11) All I know for sure is that there's definitely a saving/syncing problem on PC Apple Notes and I don't know why.
Workaround:
1. Type whatever you need to type on apple notes--be mindful of the top right status of your notes. (It should say 'Edited')
2. As soon as the website goes from 'Edited' to 'Saving...' just stop typing--whatever else you try to type will barely save or won't save at all. (Trust me I tested this with a 5 minute wait time)
3. Go to the top right of your screen click on the avatar icon and click sign out. Then Click Trust and Sign Out (to save you time, but if you press sign out it worked too)
4. You should see "Changes are being saved" header just press cancel to this (to save you time) and on the top of your screen after clicking cancel, you should see 'Leave site' header at least on Google Chrome--click leave.
5. Then if you followed the steps correctly you should be on your icloud hub still signed in. Just click on your notes again, if you notice on the top right as you enter notes again the "Saving..." will say "Saved"
I tried waiting for 5 minutes multiple times during the 2nd step and 3rd step to see if Apple Notes would properly save/sync characters I typed after I typed when it already said 'Saving...' but it wouldn't save the full message. And even with this workaround a few characters might not save. I don't why there is no manual save button on the website...