Font file Name Strings exporting as 'period'

Sometimes, and I have no idea why… but my typeface exports with a period glyph as the ‘Font Family Name’ in the name tables It also seems to happen to the ‘Font Subfamily Name’.
It also seems to be writing the copyright info into ID 1, where it used to be in ID 0, along with a bunch of other errors where entries seem like they’re mapped to the wrong ID.

Is there something super obvious that I’ve missed?
I’d rather not re-write the tables manually for every style, and I’m a little unsure why it’s happening.

Do you happen to have a “Webfont Only” custom parameter in that instance?

Ah yes…!

Thank you Georg.
Missed that.