I'm not sure that jumping down people's throats for a simple typing error is terribly helpful. Certainly it is not very welcoming.
There was an 1827 "census" by the local vicar I think.
I'm not sure where the children would be. Perhaps with grandparents? Toddlers were sometimes sent off to relatives if a new baby was due. Or if the parents were struggling, prehaps both working so hard that they were unable to care for the children. I've seen lots of children recorded in the later censuses as "nurse child" which means that they were being cared for (for payment probably).
PS And I wonder if some of the "children" down as non-resident had simply moved out? Working as servants or something? Maybe the the bulk of the NR children were quite old?