You have to trace everything to its source.
IGI began as a collection of unsourced contributions. These were highly unreliable.
Later they started a program of systematically transcribing sources. This info was much better (though officially it was still only a finding aid - you were supposed to get the microfilm of the source sent to your LDS center).
But they didn't keep the good stuff separate, they mixed it all up. Worse, if they found duplicates, they suppressed the sourced transcription and showed you the unsourced user-contrib.
Now they're trying to sort out the mess.
What you've got probably comes from here
https://familysearch.org/ark:/61903/2:1:94SS-9TB
As you see on the left, the source is "Patron submissions". This is bad news.
If you search again, the christening is here
https://familysearch.org/ark:/61903/1:1:NRMZ-8FZ
and the mother is shown as Jemima Bishop, not Sarah. (And Philip is spelt the old way with one L.)
What you need from here is the film number, 962973. Go to Catalog, click Film/Fiche Number, enter the number. That takes you to this:
https://familysearch.org/search/catalog/248905?availability=Family%20History%20Library
So the Devon and Cornwall Record Society published the Colyton register in 1928. Seems like the LDS bought one volume and photocopied the other and put them on microfilm.
Then presumably a volunteer with a microfilm reader copied it all onto data sheets and a punch-card operator punched it all onto cards etc.
But obviously that's just the christening. The marriage and the christenings of the children are all separate records. You have to put them together.
In the "patron submission", somebody has put it all together already. In this case they may be right. But you shouldn't assume they have any more knowledge than you do.