Unity beta version number question

Unity Engine
1

Maybe a dumb question, but why have we gone from Unity 5.4.0b17 to Unity 5.4.0b9 release?

Thank you

2

It’s a website error, 9 is not the latest version, its an old version from march.

3

17+1 is 9, don’t you see?

4

Thanks, I missed the March date.