The problem: If you edit a note record, and remove part of the note by using the Delete key (not the Backspace key), hit save, then the edit appears to have worked (the change is even updated in the display), but as soon as you refresh the record, you'll discover that no change has been made.
Following these same steps and editing text in the unit title field, however, works fine. Users can also edit the notes text by using the Backspace key.
Tested in Chrome and Firefox, with Windows OS.
Also tested in Safari on a Mac using fn+delete, and the same problem happens.