If the object type solid ground photo, make sure the polygn collision is configured correctly, remembering that should cover the entire area of the floor. transparent parts do not need the polygn collision, it also seems that the image point is in the middle of the character's figure, reposition it to botton. if you provide the .capx I can give a verified.
Likely an issue with the collision polygon of the character. At least on one of its frames. And if the animation is a different sprite than the sprite used to handle collisions (and which is likely an invisible sprite on that screenshot), then it's likely an issue with the position of the origin point.