250f valve issues(sticking)

Today when i was riding my timing chain somehow fell off of the bottom sprocket. When I put it back and re-timed the bike I noticed that there was about a 1/8 inch of valve clearance on the both exhaust valves. there is no compression and I am looking for any comments or concerns about what might have caused this. im going to tear it apart later and see what I find but any advice would be awesome. Thanks!

The piston hit the valves and they are bent not allowing them to close. Why did the chain fall off.

Yeah, bent valves for sure.

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