If you record o Base Animation with 144parts in 60 Parts its default that you see Stutter
example a video thats 1second long that counts from 1 to 144
in 144fps you see
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
in 60fps you see
1 4 8 11 15
The GPU generates "smooth" images related to your Display refresh rate thats 144 so you have none smooth cuts if you record in 60
Thats the Topic
simple easy and nothing mystic
OBS can't recreate the GPU generated "Pictures" that the GPU creates for the Display so in every try you do the Display missmatch the record you will have stutter if the timing from the generated frames is "bad"
to get 100% accuracy you need to adjust Display and Record to the same base
so as example you record your video in Display refresh rate
Later in a Good Video editor you can "adjust" the FPS down with tricks like "insert intermediate images" to a smooth 30/60 fps video (needs a lot of CPU/GPU power more then default)