I have seen some cases where it is needed to have the Theme set to default, applied, closed, and then re-applying the theme.
I’ve seen where it allows you to “set the theme” to the new one, as it still remembers it was supposed to be on the new one, which is the reason I’m specifying the steps in the first sentences. Give that a try.
If it does not work, try reaching out to the rest of the team on the Duelists Unite discord in the #omega_Support channel.