Oh, I think I know - it interprets more than three dashes in a row as a "section break" and replaces them with an HR tag. I don't think there's any way round that except for replacing the dashes with something, and as it doesn't display in a fixed-width font here, they wouldn't line up right anyway...

Still, I know I need to get back to actually doing finger exercises again!

It looks tough to me.. :P

I can't make a bit of sense from it, but I'm sure it sounds pretty, lol.