I got a new string on my bow. I sighted it in at 10yds, then 20yds, then 30 yds. Ok so it seemed to be going good. I take it back out today and it's all to heck! 4" high and 3" to the left. I adjust and now it's dead on. An hour later I go back at it. 2" low and 2" to the left.

I'm not the best archer in the world, but at 10yds come on!
Any suggestions?