My husband says it’s likely that the second girl just doesn’t have enough proof/pictures together with her spouse. It does make sense, as many people do Katb Kitab in Jordan and the American spouse leaves, scheduling the wedding to be after visa issuance.
A traditional couple would struggle to come up with evidence of a bona fide marriage, and I think that’s all it is. Plenty of people were too poor to host a wedding party at a time in their life, but they have a child for example at the time of the interview, so the CO is convinced.