^^ I'm not surprised at all. I've always suspected that Moffat's scripts broke the one page per minute guideline. He crams in so much dialog that I long suspected that his scripts had to be longer than the norm just for a regular length episode. I think this contributes to the impression that he is a slow writer! He just fits in more per episode.
So, I don't think that's odd at all, fits right in with my perception of his scripts.