i've never seen that happen before!
I'd never seen that either. And when it happened, I was flummoxed, and of course thought it was me. But the two choices are (a) I hit quote, or (b) modify is doing something strange.
So I clicked quote, and even in that case, it didn't give the same results, i.e. I got
Cursor is here... so in post, it should be outside of quote.
However, the behavior in the post was...
Very strange. And interesting!