Your AD Sync Status is still "Running"?
When completed, the status should looked like this.
You might like to consider setting your Process Manager Active Directory Settings > AD Sync Process Interval to a full 24hr? (1440 mins) just so the first sync completes before the next interval starts. Then you could adjust the frequency if necessary.
I remember having problems with AD Sync once where "Total AD Users To Be Synced' is always zero. For days we couldn't figure out anything because nothing has changed other than a server restart. We managed to kick start it again by filling in the account and password and that first update synch took over 2 hours to complete.