The letters look like yod-chet-vav-chet instead of yod-hey.
Note the four-letter name of God, the Tetragrammaton, surrounded by light, at the head of the title page. This edition was aimed at both Jews and Christians. The letters look just like the inscription on the Church. I don't know if the church caligrapher was copying from a Bible like this, following a tradition of not writing God's name, or just made an artistic error, but I would not be so quick to say that he made a mistake.