To explain the difference between the two numbers:
"Number of Active Users Today" is generated dynamically according to
your time zone.
"Most users ever online on a day" is a static value saved in the database; each user can update this value, and according to the time zone of each user, User #1 maybe can have more people online on
his "Today" as User #2 (because they are in different time zones)
I hope anybody could understand this
Mystics