Are there any signs of leaf miners? They can cause distorted growth.

When mine look like that I spray them with Spinosad (Organic). Captain Jack's Dead Bug Brew. It kills everything that munches on those leaves, whether it is a mite or an aphid. Good Stuff. I use it on herbs too. Right now I'm spraying it on my tomatoes to get psyllids, as well as on my Jalapeno and Thai Peppers that are showing some of those crunkly leaves.

-Babka

Hi, it"s not bugs but a lack of bone meal. just mix some in the top 1 inch of soil. This is something i just found out my self after trying to grow peppers in shasta lake. Also if you start your own seeds do not use peat pots or any seed starter mix with peat it retards the growth of peppers for some reason.. here is the site where i found this info. at hope this helps.
http://www.ecoseeds.com/Pepper.growing.tips.html