Hi 'Monkey, Welcome to the forum! ...and Howdy NW neighbor!
I'm not a canning expert (and I don't even play one on TV
) but I've seen that black stuff on different canned stuff. Tomatoes, peaches, salsa... My non-expert opinion is that it is something reacting to the ring or the lid.
Is it outside the lid on the jar or ring or is it inside the jar under the lid?
If it's inside, replace the lid after carefully wiping out all the bad stuff.
If it's outside the lid, it seems to occur when the ring and the top of the jar aren't cleaned after the "stuff" is put into the jars. And it could be just the little bits that didn't get cleaned off the jar that are molding as opposed to reacting with the jar ring. But since you are dealing with vinegar, I'd lean towards the reacting opinion.
I have some homemade dressing that has vinegar in it that I put in a pint jar with a lid and ring and it's getting black stuff on the outside of the jar threads and that jar has been refrigerated, so I doubt it's mold. If the lid is good, I don't think you'll see the stuff on the inside of the lid or in the jar. You didn't say if you "canned" the habs, so I'm guessing they are just soaking. Try removing the ring and lid, wash the ring and lid and carefully wash the jar top also.
I'm just curious, did you "open" the chiles when you put them into the vinegar? I mean, are they whole peppers that the vinegar can't get to the inside of the chile, or are they "open" somewhere so the vinegar can get inside the chile also?