Verify the material.

Depending on the age of your database, the materials were enhanced a couple yeas ago to allow a "gauge" ("Specification") like sheet metal has.

If the material/spec is set differently between the two, this could explain it. 

If anyone has used an older version to edit the database, it could have potentially stripped some of the additional piping material properties that were added in recent releases.

If the content is from Building Data, I believe the material may be locked. Either they messed it up (unlikely) or the material settings in your DB have changed.

OD use to be controlled by the Spec. It still can but the proper way to do it now is via Materials. You may have a mix of methodologies going on which could also be contributing to the issue.