In several bib files we have not a unique formatting for the month:

Example:
Some bib files used for testing have different formats for the months.
This should be made consistent across all files

correct;

  number    = {1},
  pages     = {55--68},
  month     = oct,

other looks like

  number    = {1},
  pages     = {55--68},
  month     = #oct#,

other looks like

  number    = {1},
  pages     = {55--68},
  month     =  {#oct#},