Its just that the return key can sometimes send an old fashioned carriage return + linefeed, or carriage return only, or sometimes line feed only.
These can be simulated by control+M for carriage return, and control+J for line feed.
Is there no way to change the behaviour of the "return" button?
No it means it didn't 😞 Sadly
Ahh well. What is missing is a line feed character I suspect. There must be an answer, cursor down maybe?
What an annoying problem, does it happen on the mobile version of the forum as well?