Hi Iver+Larsen,
I’ve had this happen to me as well. I believe Paratext simply remembers the last selection you had made for the Notes typing language. It’s possible that it could be was accidentally or because of pasting in something from another language perhaps?
I would try this: Change it to something else such as Avokaya_English and then type something in the note. See if it has stayed as Avokaya_English. If it has, click okay to submit the note. Then return to the note and see if it has defaulted to Avokaya_English this time.
According to the help files, you can also highlight words you’ve already typed and change them to whatever language/writing system you wish.