ATC stops halfway with flight following. How to fix

Beside still having problems with exporting Simbrief OFP in FBW Flypad in the MCDU, more irritating is that my flightplan made in “World”, including valid waypoints, in MCDU is only partly followed by ATC. After around 4 waypoints, the ATC goes back to the previous waypoint (so basically returning to origin airport…), instead of advancing to the next waypoint. Only hope is that the final airport is within range of nav tool… The nav tool does not show the next waypoints…