I did a batch of pickled peppers and a batch of pickled cucumbers. Pickled peppers came out GREAT! The cucumbers i did spoiled in jar. Both batches i did the same recipe with the exception that with the cucumbers i used apple cider vinegar and the peppers i used your normal distilled white vinegar. I did at least a 3:1 ratio vinegar to water ratio on both. Both were 5% acidity and both were sealed the same way in a 15min boiled water bath.
I cant figure out why the cucumbers didnt can properly where the peppers did.