Flybys timing out by hours, like its a time zone thing..

My time compared to others in flybys seems to be out by hours. I know I have followed or passed people, but in fly bys I complete missed them, bu hours. Also when I start playing a ride, I can see the paths of other users in their colour, but they don't show up until the end of my ride. 
Its like we are on different timezones, but across multiple computers I am on the right time zone for where I live, unless Strava has its own way to setting a time zone..

Any ideas?