Canning lids twisting
You should not put the bands on "tight".

From Fresh Preserving Water Bath Canning


  CLEAN mason jar rim and threads of jar using a clean, damp cloth to remove any food residue. Center lid on jar allowing sealing compound to come in contact with the jar rim.  Apply band and adjust until fit is fingertip tight. Place filled jars in canner until recipe is used or canner is full. Lower rack with jars into water. Make sure water covers jars by 1 to 2 inches.


Fresh Preserving Problem Solver

Condition: Lid buckles, appearing to warp or bulge upward under the screw band. If spoilage is evident, do not use.

When buckling is apparent immediately after heat processing, cause is overly tight application of screw bands.  Using your fingers, screw bands down until resistance is met, then increase to fingertip tight. Do not force. Do not use a lid wrench to apply bands.