I was shooting today and noticed I was shooting a little low at 20 yards so I moved the pin down so I would shoot good again...well it worked for about 5 shots and then it shot low again and I reajusted it again... shooting good. get my arrows go back and shoot again and now I can't go down any more with my 20 yard pin so I put the 30 yard pin on it and shot good but guess what happend after 5 or6 shots? it did it again... so here is a picture I hope you know what is wrong here! the arrow was perfectly levela week ago.

Are your brass nocks as tight as you can get them? They look like they're sitting awfully high to me. Is there a chance they may have slid up the serving?

brass nocks moving on you?

edit: beaten by 39 seconds

Brass nocks moving up....maybe WB is loose and sliding down. It doesnt appear to be very square in that photo.

I checked that and they are not the bottom one is a little but I don't think that would do anything!

no it is not that either I tried to move it and tightin the screws down but they are as tight as they will get. yeah it is not the streightest but it is tight!

Wisker Buisquit is not square and it looks like you are WAY nock high. Almost sounds like maybe your center serving is slipping. Notice any serving seperation on your center serving?

Can you take a picture of your center serving. That is what I think may be the culprit.

doesn't seem to be. I had this happen a few weeks back to but it was not this bad!

It has all the signs of center serving slipping. Does it have the nylon (almost plastic looking serving)?