Actually this can be caused by any number of things. Here are a few examples.

You may be twisting your grip a bit
You may be pulling the string into your face too much
You may need to get your eyes checked (not kidding - poor eye sight can cause all kinds of problems).
You might have a spine problem
Could be a draw length problem.

You may simply find this bow never has the pins in alignment with your string & rest.....I have seen bows that shot perfect paper tears but the pins set outside of the line of the arrow & the string. If you shooting good & having no problems I just don't think Iwoudl worry too much about it to be honest.