PFS. Why the difference in symptoms between the 2 major websites?

How is it that the 2 major websites for PFS ( and ) have different symptoms described ?

For example diarrhoea is just mentioned on propeciahelp and not on PFSfoundation.

Do these 2 parties not communicate/work together ? Why not ?

And what are the sources for both parties ? Which one is more accurate … ?

Thank you!