Hey VS
Some great advice above, but my two cents agrees with what Friend posted
"Would highly suspect that the arrow is not directly under your eye".
Some years ago I used to have an issue with some shots going a few inches left, grouping very nicely, but 4-5 inches left at 20 or so meters. When it reared its head, it used to give me fits, everything else was feeling great, but why were they hitting that bit left?
Took a while but I worked it out......I was overdrawing it.
I shoot " Gap-stinktive"
I focus on what I want to hit, draw, anchor, re-focus and then the string slips off my fingers. I don't use the arrow to aim, but I can see it in my perifirial. If I find the shots starting to land left but grouping well, experience has shown nearly 100% of the time, I'm overdrawing it a tad. And because I'm not actually looking at the arrow, I don't pick it up.
If I overdraw it (and it doesn't need to be much), I reckon it puts the nock of the arrow a hair further out on my cheek, to the right of where it's supposed to be (I'm right handed), so the arrow is pointing a smidgen to the left. If it's pointing left, rest assured it'll hit left.
If it happens now (rare), it only takes a moment to realize whats going on. Usually only happens if I'm tired after a big day at work, or I'm simply expecting the shot to happen, not actually making it happen (which really means "getting sloppy"
)
As soon as I realize what's happening, the shots go back to striking where I'm looking.
The brain is a marvellous thing hey?
Hope this helps someone.
Best
Lex