My brother has been shooting his broadheads for two weeks now and has been shooting them fine!

I guess yesterday he went out and shot 20yrds dead on but when he dropped back to 30 he is now high and right??

He swears it looks like nothing has moved but after examining his bow he thinks the top limb may be starting to crack around the limb bolt??? I am going to go pick it up for him now and run it to the shop to have them check the limbs out, but is it possible that a incorrect nocking point/rest movement would cause this all of a sudden??

I dont know how you are dead on at 20, but HIGH with your 30 unless the pin has moved which he says it hasnt??

Any Ideas???