Anette,
On John Sexton's May 2016 newsletter, John wrote an article about the film backing issues on Kodak 120 film. Below are the lot numbers of the affected rolls. You can go to John Sexton's website and read the entire article on film backing. Check your lots numbers against these listed below.
Emulsion numbers that may exhibit the above problem only in Kodak 120 format roll film:
(Emulsion numbers can be found on the film box, the foil wrapper, and printed on the clear edge of processed film near frame number 11.
Kodak T-Max 400
Emulsion 0148 004 through 0152
Kodak T-Max 100
Emulsion 0961 through 0981
Kodak Tri-X
Emulsion 0871 though 0931
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