Try replacing all those events with this one:
On every tick-> Set player X to 105
See if it helps.
Doesn't seem to be doing anything, eventually the player just from running goes of the left side of the screen. It wouldnt be anything to do with the animation would it? As on landing the run animation starts from the beginning so it will twitch slightly form the falling animation.
Another thing maybe.. Because the platforms are different heights you are jumping to, all the jumps don't last the same length of time, some small jumps some long jumps. Maybe that? But i wouldn't know what to do with that
imgur.com/a/fAREz
imgur.com/a/pQLk3
^ to give you an idea of the game and whats happening
Edit:
Or maybe something to do with this? imgur.com/a/Y958p
Fairly new to construct so i don't know exactly what everything does and effects yet