So, I finally put a new bar on (same as the old bar), and after a couple of cuts, this is what happens. WTH? The adjusting screw won't go any tighter, so I'm wondering if the chain might be stretched. Does that even happen? Sprocket is worn...could that cause this? I can pull the bar out and get it tight, but it keeps loosening. Very frustrating when in the woods. Any help is appreciated.