No offence taken. I have made those walking shots before without incident (more than a few times). This is the first one I screwed up. Just the same, you are right. I probably won't take another shot like that.
ORIGINAL: BagginBigguns
You mentioned that you may have torqued the bow, but now that we know the deer was moving when you shot, that was clearly the reason for the gutshot.
Not that you're looking for advice or anything, but I don't recommend shooting at moving deer. This is a shot that nobody practices. Even if you do, your practice is likely shooting at a target moving at a different speed than the actual deer that you shoot at. We can argue how far is too far all day long, but moving versus stationary is not really an argument. Unless you have the resources to properly practice shooting at moving targets, I don't feel that it's an acceptable shot to take in the field.
You posted about a gutshot, so expect some criticism. All suffering aside, I'm glad you recovered the animal.