Hi tymeon,
I'm not sure what the problem is, Windows likes to do funky stuff, but I'll try to help. Are you on a 4k display? I would first make sure that your in-game resolution matches your computer resolution. Then my only suggestion would be to retry number 4. Here is a picture of my BattleForge.exe and its properties for reference:
Make sure that you have the "BattleForge.exe" file with the DPI override checked. Also, make sure that the rest of the exe's in the BattleForge folder do NOT have the override checked. I would then start the game and then quit out of it.