Bow hunting can really mess with your mind real bad when stuff like you said happens! The only thing I can think of is that where you swore up and down on where that arrow went, it must not of went. The fletchings and arrows have made liars out of us all at times on where we think we hit the deer and when we later find that deer our thinking was 3" to 4" off from where we could of swore it went. Last night for instance a buddy of mine shot a doe fawn, he said the arrow was a little back but not much, we found the deer about 300 yards from where he shot him. The arrow went in about 6" back farther from where he swore he hit it, he ended up gut shooting it and caught the bottom of the far lung. Keep your head up buddy!