Hi
Thanks a lot Ernie, for your quickly answer. This is the flight plan generated by RouteFinder, inside the FSBuild:
KLAX DINTY R577N EDSEL R577S FICKY B577 TUT B450 LHI UH258 SHARK YSS
It looks like the flight plan is OK but checking the waypoints page, I've noticed once in B450 airway, the route takes me over DOLSI and NANFENG (NF) waypoints and that's the problem. These waypoints are 4593nm away, one from the other one and the final distance to go is 15098nm

I've updated the airac cycle (downloaded the zip file, extract to FSBuild folder, then go to Options->Create Fsbuild2 Navdata Indexes and restart FSBuild), but I don't know what can be happening