User Login Counts Appear Inaccurate

Hi,
I just realized last month that the user login stats (provided by S2Member – I have the pro version) I see within my WP dashboard don’t seem accurate.

For instance, certain WP users who only registered a few days ago would have over 50 logins from the time of registration, which isn’t possible based on verbal confirmation I’ve had w/ one such user. In other instances, I know the user has logged in multiple times, but the last login date (along with the the # of logins) would show a hyphen, suggesting the user hasn’t logged in.

I know some caching plugins interfere with certain statistical plugins. Is there a known conflict between the S2Member user stats for WP users and caching or other plugins?

Cheers,
Darren

https://wordpress.org/plugins/s2member/