I was cutting up a big white oak and i hit metal a few times. Sparks flew. I sharpened the chain using my stihl 2in1 sharpener and it starting cutting crooked. Would getting it sharpened on a machine get it back to normal? The teeth look ok. Some that were more beat up got filed more, would having some teeth slightly shorter cause crooked cuts? One thing i did that was new was face the tip of the bar and file each tooth in a row by turning the sharpener instead of doing all of one side then the other. I used to alway lean over the powerhead. That doesn't seem like it would be the reason but i didnt try it the old way.