Samz707: I managed to solve it with some trial and error, I saw claims it was FPS related but my graphics card limiter(AMD Radeon) wouldn't limit Aftermath for some reason. (I could set the setting but it would fail to actually limit it.)
However Bandicam (A free recording software) comes with a limiter and sure enough, it works, locking the game to 60 FPS fixes the Geoscape Issue. (I've updated the PC gaming wiki page for Aftermath with the fix.)
So for anyone else with this issue, you have to (via some sort of external limiter) limit the FPS to 60.
Thank you. I have been looking for days how to play and yours is the first post that fixed the problem.
If you are up for it post the fix wherever u can. I'm of playing. Thank you again