Bug when working with open paths

Hi!
I’m experiencing a problem when exporting my font in open paths. Some lines are broken and the path is not neat.
This is an example
http://lettersbymartinaflor.tumblr.com/post/74935046985/bug

Do you have any advice to solve that?

Thanks a lot.

can you send me the .glyphs file?

I’ve just sent it!