Hi Oz,
I downloaded your ELBIMB_2.mid and opened it using MuseScore 2 and did not see any bass clef notes - all the notes appear to be within the treble clef.
However, on my Genos, there are some bass clef notes displayed on the Score screen, just as you saw in bar #78, 81, 82, and 85:
I looked at all the available score view setting options but could not find any option that could make the bass clef go away.
You may want to call 714-522-9000 Option 3 to contact the Yamaha customer support (Monday - Friday between 7:00 a.m. and 5:00 p.m. Pacific Time) to seek for their advice, or request for a fix.
Thanks,
Paul