Don't remember seeing this on mine...
Tom,
I'm about at the same place on my wings as your are.
I've taken mine apart for primining this week, so I can't go take a look downstairs to look at the fit. I don't recall having any gap however. I had a very snugg fit on every rib. From the picture it looks like the maybe some of the flanges are bent in a little - are they aligned with the rest of the flanges?
I don't think it will hurt to leave, but I would bend them out to support the skin as much as possible. I'll remember to take a good look next weekend once I reassemble post priming and let you know.
Ken