Martin Roe Eidhammer has written a blog post that perhaps should be required reading for anyone researching Norwegian ancestry. He writes about the archives that have been published on Ancestry, MyHeritage, and FamilySearch. The records that have been the focus are:

Martin Roe Eidhammer writes:

"The church records from 1801 to 1815 are completed. A large number of the records from the years after 1815 have also been done. This is thanks to the effort of a large number of volunteers. They should be commended for giving their time and energy to this work. There is, however, an elephant in the room that can not be ignored.

"While errors may and do occur in any product, it has turned out that the transcriptions produced by the AMF collaboration contain a disproportionally higher number of errors than records transcribed outside the AMF."

The Eidhammer's article then goes on at some length to describe the transcription problems. You can read his full article at: https://martinroe.com/blog/a-word-of-warning/.