Where in the depths of this program would it reference a previous projects Formula-Based Material thickness? Or is there a defined name somewhere that I'm missing and can't find?

In the current project's M! spreadsheet, all of the FBMs are listed (hard numbered, not referencing any defined names in a formula) correctly at 0.75". But the 3d parts display at 0.7087" (18mm) which was used on a project a few weeks ago. When I change the material to a non-FBM, the 3d parts displays correctly.