I was using the mobile browser version, when an error occurred and I needed to refresh. Meanwhile I had the stats page open on a laptop, to make rolls easier.
Hi Diamond_in_the_Rough, this would likely be your issue.
From what I understand created two versions of your character sheet. One of them without your notes. So when you refreshed the character sheet you were using as a notes page, it changed to the other version, which you were updating with no notes on it.
I would recommend using some other method to take notes, or using the same character sheet tab/load that you are checking your stats on for notes as well. If you have multiple instances of your character sheet open at one time, it will be difficult not tol face issues if you're making changes on some of them and not others, as they do not automatically sync across instances.