It is a CamSim file downloaded from this site. I have downloaded several CamSim Boeing 787-8 and put them together in a single file. Thus it 's happens in all aircraft (about 10). The only thing I have added is the new planes in the "aircraft.cfg" file, maintaining the correspondent sequential number. No other modification has been made in such file, which in my opinion is "the responsible" of such floating aircraft. Maybe it's something in the geometrical or so.
Thanks