I have had the same problem and I do prefer to sprout most seeds in jars so what I've found is not putting so many seeds in at a time. You may have to process 3 jars instead of just one. The other reply is right as cramming them results in lack of oxygen. You will still get lots of sprouts and they will be much happier if sparser. Small seeds in soil I just find tedious to cut etc. I like to be able to just grab them out of the jar or store in the refrigerator when ready and toss them right in a salad or smoothie.
good luck
good luck