Having trouble with variable frame rate footage and audio sync

I am making a tutorial video for a billard system, where i filmed with two cameras that shot at a frame rate of 25 fps and a screen recorder shooting at 59.94 fps (and i have no idea how to see if it is constant or variable frame rate it shot in - i used the dvr function in the xbox app). I have tried interpreting the 59.94 fps footage as 25 fps and line it up with the 25 fps clips, but it still goes out of sync. Even when i sync beginning and end, it will still get out of sync in the middle.

I know that it is bad practice to use different frame rates like this, but i would like to know if there is any way for me to get it in sync, or if i should just give up at try to manually make segments fit as good as possible. Also, i am not sure i completely understand what is going on when it gets out of sync in the middle, so if someone has an explanation for that, that would also be nice.

Thanks in advance!

Mod note: Title changed to reflect problem.