I had a good harvest of carrots this year. Today, wife and I canned 21 quarts (3 batches) in our new presto pressure canner which we bought for $80. Anyway, I dont recall which variety of carrot we have, they were supposed to be long and slender but a lot of the carrots are almost 2 inches across at the top. Any idea what causes this? We are in zone 4, upper midwest. Thanks