Question regarding canning.....22 quarts of pickled beets down today.......recipe is 1 cup beet juice, 2 1/4 cups sugar, 2 cups white vinegar, 1 tsp salt. process 20 min. My problem is that on the last run, two of my jars broke in half. This is not the first time that has happened....which is hugely frustrating as it makes a big mess and then I have to rework it all watching out for glass. Why are they cracking? Too hot of water, too cold jars? The jars are hot taken out of the dishwasher, hot filled with beets, hot filled with syrup, then they cool slightly while waiting their turn in the cooker.......long canning day today. And tomorrow is another one.