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

How is it that the 2 major websites for PFS (https://www.pfsfoundation.org/about-pfs-post-finasteride-syndrome/ and https://www.propeciahelp.com/post-finasteride-syndrome/ ) 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!