Body font changes in Edit mode

When using BB to edit a page, the body and heading fonts change to Verdana. When I save, it changes back to the custom font that it should be.

The custom font is loaded with a plugin, Custom Fonts by Brainstorm Force, and it shows up correctly in the font lists in Beaver Builder, but then it just goes away while editing.

Clearing caches doesn’t seem to help, and I turned off all font optimization options.

Has anyone ever seen this happen?