Some of everything, and you have not offended anybody!! The most accurate are from performer/author songbooks, but sometimes we find them already posted on the Web or someone transcribes them from recordings. In those cases, mistakes are likely to be made.

We don't know who transcribed the lyrics we find on line, so they could well be wrong in some cases. Some songs are transcribed from the recording and it is often easy to mis-hear a word or phrase. Some of our most interesting discussions are about those.

Then, there are the songs learned from other people, such as friends, family, etc. Often there are many Versions of a folk or traditional song and no one Definitive version.

In short, post away with your corrections, as you call them, and we'll no doubt argue about the Final Answer!