Hello to the forum,
I‘m sorry to write in a new theme, what I asked already in another theme (Dorico Middle c) already, but I have to add the information, that my problem with the middle c occurs only in the Dorico for iPad version, not in windows- or macOS-Version.
I opened this new theme, because I‘m not allowed to answer more than three times to one theme (I don‘t know why) …
So please excuse me,
kind regards, Thomas
Don’t worry too much about the limitations you’re facing with the forum, it’s normal Discourse policy. The more you read and write in the forum, the less those limitations exist 
However, and because opening different threads (or bumping threads) is considered impolite here (and I see you did not mean to be impolite), I tell you that you can modify your posts by clicking on the pen icon that you should see at the bottom of your post. You’ll know for next time 