Lids Buckled During Canning... Problem?

[Clay]

yup, I had a jar of peaches do that last week. I thought I must have sat the jar down to hard in the canner, but maybe I had the band on too tight.

 

[bwframe]

yup, I had a jar of peaches do that last week. I thought I must have sate the jar down to hard in the canner, but maybe I had the band on too tight.

I was under the impression from am earlier thread that my issue was with jars cooler than the boiling canner water. This makes more sense to me.