Raglan Increase issue

Hey everyone,

I seem to be having an issue with my Raglan increases. I've done about half of them, and they seem to be doing a funny pucker. I'm using a yarn that's very different from what's requested (it's about 40% nylon) but I don't have the ball band with me right now to say what it is.

I don't think I messed up and did two decreases at once.

I'm just wondering if anybody else found that their increases puckered as more stitches were on the needles and if it went away when the stitches weren't so crowded.

Thanks in advance.

-Saff