Did you blanch them first,or pack them raw? I know that if you blanch or precook a bit, it takes some of the oxygen out of them, or some chemical reaction-thingy-whats-it, that makes them pack tighter. Packed raw, any veggie or fruit will seem to float up like that and look like you didn't pack tight enough (when, in fact, you probably jammed them in quite tight when raw!)
I have had that happen too. I am not sure what can be done but I know with pickles they make something to help them stay crisp.
I saw it in Walmart one day and thought hmmm where was that when I needed it.
I still haven't tried it since I haven't started canning yet this year but I wonder if you can use it on other things like the peppers.
I love those jars of sweet pepper rings but the ones I buy are never really crisp so I wonder if that is just the way it is with certain types of peppers.
Well congratualtions on it anway, I say anything we are able to preserve deserves a pat on the back.
I use Calcium Chloride (CaCl2) to keep pickled things crisp in the jar. It's a salt, a compound of calcium and chlorine. It's widely used in the pickle industry and other food applications.
I buy it here, in a 16 oz bottle. Plenty to do a year's worth of pickling and get you started next year too. You only add 1 1/2 tsp per quart or 3/4 tsp per pint jar.
Other places carry it, like bulkfoods.com. If you have a small local shop with brewing supplies, they often carry it. Be sure to get food grade, no matter where you buy it. (The non-food grade is used to melt icey sidewalks, control dust, etc.) There used to be a product called Pickle Crisp by Ball that's no longer available - it was Calcium Chloride.