Firstly, check if you have activated the Job Order field in Detrack. If you have not activated Job Order field, you can go to Jobs > Job Settings > Fields > check Job Order.
Secondly, ensure that the option for "Do not sort jobs" has checked by going to Job > Job Settings > Sorting > check "Do not sort Jobs". Save.
Then, go to www.RouteMyFleet.com and click Export > Push to Detrack. The job order from RouteMyFleet will push into Detrack's Job order field.