Bear in mind that the concept of 'correct spelling is largely a 20th century innovation. In the late 18th century there was no such thing as 'correct' spelling.
I looked at that map but didn't go far enough up Glen Artney.
It's one of the exclaves of the parish of Monzievaird and Strowan lying between the parish of Comrie and the parish of Muthill. There were quite a lot of fragmented parishes, but most of them were tidied up in a reorganisation of boundaries in about 1891.
As for the conflicting information in Ancestry, you need to check carefully the origin of each of the details listed. If it's a microfilm of the original parish registers, which are held in Edinburgh and available online at www.scotlandspeople.gov.uk, that is a primary source and reliable, although errors are not unknown. If it's from a submitted family tree, or if the marriage dates are a guess by some transcriber based on a date of birth of a child, they are not to be trusted. [b]Never, ever, believe anything you find online unless it's an image of an original primary source.[/b]