No, it is not you. Destiny Public Events is a crap thing... I keep saying this to my friends who swear to God it is amazeballs and perfect... as we stand around with our ghosts for minutes after the event is supposed to materialize.
The Divide public event is usually 5-7 minutes late on this site. On the other hand, Achers Line and some others are accurate if you go there 2 minutes before the timing.
Problem is some are clicking when Swords of Crota spawn, so the timing is sometimes messed up.