Your post reminded me of a trip that I took with our grandson when he was three. My Brother-in-law had built all of his kitchen cabinets. My grandson get staring at them and finally said "why are all the knobs on the right except for this one". My BIL admitted he had made a mistake and nobody would notice.
If it bothers you fix it. I would have the recipient look at it and see if he makes any comment.