I ave been using the sticky note tool to due a lot of marking up for a course I am doing.
I have noticed some very frustrating behavior.
In Edge - content is cut-off (Version 137.0.3296.62 (Official build) (64-bit)) In firefox, some notes will no display content when clicked. A red box appears with name and date (139.0.1 (64-bit)) (I have included half of the red box here as it has personal info)
In chrome, content is sideways and not all of them appear (Version 137.0.7151.69 (Official Build) (64-bit)) Reason this is frustrating , is I have done lots of work, and all 3 browsers are not rendering content. I will have to re-do so much and this software (which previously worked).

I have updated to the most recent version od PDF-Xchange