Very odd one...

If I reply to a thread with a quote, as I start typping, it will let me get about 10-15 letters in, then start putting any additional text in the line above.

I'll try to give an example, let say I was replying to this:

"Goats are blue".

suddenly this happens.
I start typing and

Anything added to the line then gets put in the line above.

If I press enter a few times, the problem goes away.

Very confusing