Okaay, see if this works. In Cubase. Go Shift+F2 and show the info line.
On your “Nexus” track or part (the bit that says "File, Description, Start, End, Length etc.) info line does it say “Nexus” under the File header?. If so then try changing the Description (which should also say “Nexus”) to one which makes more sense.
See if that Exports with more sensible titling. Should look like “Nexus (Lead synth)” now?