asp.net forms authentication showing same LastActivityDate for all users

I'm not sure why this is happening, but the last activity date for all my users is showing the same. I thought it was the way I was pulling the data f开发者_开发问答rom the database, but I checked my data, and it shows the same for all users.

Is there something I need to be doing to get this field updated? I'm not doing anything special with this field other than reporting it.

I found the answer here in this article. Apparently, when I pull up the list of users and I pull the profile for each, it calls a stored procedure that in turn, updates the LastActivityDate of each user to the current date and time.