Hello, I recently got back into Making History and because of my four year hiatus, I decided to recreate the Hearts of Iron IV mod, Kaiserreich. But as I was doing the states and territories, one of the Serbian provinces bugged out and are now part of Illyria (Croatian puppet of Austria). I cannot change who controls or owns it and each time I open the mod in the editor, the province full resets with me unable to edit the positions of the province. I try clicking the Add Position button, but it doesn't work

If before clicking on the province, I clicked on another one and then clicked it, it will copy-paste literally the same information on it. Example: Before clicking on the Serbian capital, I clicked in Bessarabia, and then on Belgrade. It copy-pastes the information you have in Bessarabia, IN Belgrade. I tried to edit out the owner, culture, name, ethnicity, etc. in the region. Saved the game, went to play test it - Illyria still controls it BUT when you try to enter the province, the arrow sends it to Bessarabia.
For reference: https://imgur.com/a/Zhk32yS

I will be eternally grateful if someone can help me deal with this, I really don't want to start working on this again.