It looks right, try double checking if the image point is at the right place in every single frame, on all animations, and both sprites.
Another test you can make, remove the pin behaviour from the slashing sprite and add a Evert tick event and set Slashing sprite's position to another object (PlayerBox/running animation) at image point("Sword").
Try uploading a capx, makes it alot easier to find what's wrong, it doesn't need to have the whole project, just the part that isn't working.