It's using the GER tag but I have the name set to Prussia. And it's supposed to be labeled as the Kingdom of Prussia but it says "German Empire"

That's interesting... Germany's default neutrality ideology, and a few other nations' random ideologies, have a higher priority to be used than the rest.

So the site was exporting at the "normal" priority, and those few nations' ideologies were being given higher priority.

As such, the site will now export at 5x priority, to ensure there's no chance of the default country names showing.

If you have any further issues, just shout!

Okay so I exported again and reloaded the game and the countries in question still have their default ideology names.