Hello CrimsonLeader88,
Have you tried using the ‘Set Screen Resolution’ nodes targeting the Game User Settings? I’d recommend using the Game User Settings, as they’re Platform independent and get loaded at game startup, besides being build for that purpose. There doesn’t seem to be a lot of general documentation around them, but if I remember correctly, Mathew Wadstein did some YouTube videos on them.
If that’s not an option, try to check if they get executed.