Yep i use draw_healthbarHow are you drawing it? That looks like it's being made with primitives and one of the coords is not being correctly set. If you're using the default draw_healthbar() function, then it would possibly be a bug and should be reported to YYG. If it's not using that function, then we need a bit more information on how you've programmed the drawing.
Seems like my problem caused by engine errors and at this moment i can't fix it. Thank you anywayAnyway, a good and better alternative is for you to use custom healthbars, take advantage of the new feature in Game Maker Studio 2: Nine Slices! It's pretty easy to implement and you'll get professional results.