Hi,
I think I would suggest asking Scotland’s People for assistance, in reading the page, they will probably rescan. This may make everything clear.
Looking at the page it is fairly clear that the name entered is Francesco, and this is what it is indexed under.
Have you looked at Maria Mansfield, born in Perth in 1857, Mansfield seems a fairly unusual surname, this may be her, or a sibling.
I would not be too concerned about the death certificate, names could be flexible, especially in the Army. He was dead by the time she married, and so the informant may have got it wrong. Who were they?