Walking Animation not completing the frames

Okay, so I'm working on a project, a platformer game, which has skins, the idles normally have 2 frames and walking animations has 4 frames, they were working normally until some mysterious problem occured that made the walk animations only play up to the second frame, so when it switches from the idle sprite to the moving sprite, it'll only play until the second frame and then go back to the first frame, instead of playing all 4 frames, anyone knows why that happens?

This might be a dumb...

Walking Animation not completing the frames