I think I may have a answer to the marriage/birth discrepancy. I looked on the 1900 census for Carroll County. It shows H P Browning and Mahala with the family. However it also shows they were married 1 year with 1 child. But the family group includes several children up to age 15 if I read it correctly. That would include 1 or 2 older than Devie. Possibly the Laura Ross you mentioned was a previous wife not a later one?