Low sunlight & chilly temperatures are likely to be the problem, or much of it.

Beyond that, a picture is worth 1000s of words. Please upload one.
If you're not able, perhaps a friend or relative can help.

Could be what Jean mentioned and with the cold and low light, you likely won't get much the rest of the year. Even down here where the day temps are great, it's just too cold at night for much production. I've already started pulling some of my peppers because I know there's nothing left in them as it gets cooler.

But... the shriveling could be a sign that the compost is tainted with herbicide. You may want to test it with a link that Jean gave me once. And like she said, a pic speaks loudly.

Kevin

Here is a link that might be useful: WSU bioassay for herbicide in compost