Doing a flight from EGHH to EDDL and same again, it worked out the T/C but not the T/D even though it was a full flight plan with no errors ( RNAV flight plan for landing ) and again i pulled a waypoint from the approach and it fixed the T/D and fuel calculations.

RNAV Landing for rw05L following TEBRO 05 and this time i deleted the DIKMI waypoint from the RNAV approach in the 757 cdu and all is fine with the flight plan :)