Hey there, and welcome to the forums!
I'm not quite familiar with this particular issue as I've never heard of a user encountering this. If you don't mind me asking, what external program(s) have you used to ensure that the game's framerate is running at 50FPS as opposed to 60? Does setting the Target Framerate any higher/lower produce any other different results? You can adjust the framerate that the Frame Limiter targets by clicking the "Mod Settings..." button in the Launcher. Try seeing if something such as 30FPS produces any different results.
Hello, do you have any other software such as Bandicam or Fraps running in the background?
Also, could you show me your Frame Limiter Settings as well as listing every other loaded hack/setting?
If you have any programs as listed above running, I suggest you exit them, sometimes they're the cause of that.