Is it possible the groom was in the army? If he was, and had married without the consent of his commanding officer, it was not unusual for there to be a second marriage after consent was granted, to enable the wife to be included on the army roll.
Duplicate marriages are not as uncommon as one may imagine, there has been a series of items in The Family Tree Magazine over the last few months, where a lot of these so called duplicate marriages have been found.
Jebber