I’ve tried the setup you describe.
The thing is that this field group should not be showing up anywhere because the page template cannot be both templates. Your locations rules should be OR rather than AND.
So the next question is, do you have any other field groups that include a WYSIWYG editor?
If not, what other plugins or acf add ons do you have installed on the site? Does the problem go away if you deactivate them?
