I haven’t seen them but it might be a callback to early animation.
To keep costs down and speed up production, cartoons (pre digital animation) would often be animated at around 15 fps, sometimes going as slow as 10 or 12 fps. Each frame was then photographed 2 or 3 times to bring the frame rate up to 24 or 30 fps depending on the media. Robotech, Scooby-Doo, Mighty Max and the original Duck Tales come to mind as examples. Hanna Barbara cartoons were also known for being on the lower end of the spectrum.