Problems with Shatter

Hi,

So I'm doing something fairly simple, but for some reason I'm getting really unexpected behavior.

Basically, I've got a series of horizontal lines that I'm dividing up to get a series of vertical lines that follow the geometry I would like. This has been working fine, but recently I've trimmed the ends off of each curve to pull the vertical lines in a predetermined amount. As you can see from the screenshot, this works fine everywhere but these two areas where shatter seems to forget that the curved part of some of the horizontal lines are also joined with the straight part.

Any thoughts? I've tried rebuilding the initial geometry and I've performed all the grasshopper jujitsu I can think of...so i'm sure the solution to the problem is real simple.

Thanks