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Thank you for adding extra detail. So you are descended from Archilbald, likely first born son following Charles and Anna/Una's marriage.
From what we have above, I would say that Archibald gave order of marriages wrong
This happens on registrations sometimes
It should be first Anna/Unna Campbell, Archibald's mother (the 1843 Old Parish Register entry in Lismore that Carol found, Charles would have been aged c. 24 years then) and then Mary McInnes (again, from what we have, looks to be 1854, Charles would have been c. 36 years old). Details from the censuses and children seem to help in confirming this. The 1855 birth of Julia, daughter of Mary and Charles, will include date and place of parents' marriage along with all other details on the parents. All the children's names included on Charles' death reg are what we are seeing on the Scottish Censuses. You also have the references that I have added for births from Family Search. You can view all of these as original images on Scotlands People (pay to view but not expensive to do so).
Can find only 1 Childs Burial;
ARCHIBALD C McInnes, 1930 Boorowa, Parents CHARLES/UNA
Trish's details on likely death reg for your Archilbald confirms mother as Una (Anna). Given his birth year, helps further to confirm Anna/Una Campbell as Charles' first wife...
Monica