The module had multiple CSECTs, and the assembly had used the THREAD assembly option. The THREAD option causes the starting offset of each CSECT to begin where the prior CSECT left off.
2. Create a PDS license file. There is JCL to do this (LICALLOC) but it can also be done in ISPF 3.2. The attributes are RECFM=VB, LRECL=259 and it can be a PDSE but doesn't need to be.