problem using soundfont; Salamander Grand Piano in Musescore2

I downloaded SalamanderGrandPianoV3_48khz24bit;
http://freepats.zenvoid.org/Piano/acoustic-grand-piano.html

And I set it in the right folder, succeeded install it.
But when it plays, almost notes are no problem, but some measures' notes (especially G notes) have no sounds or strange sounds mix in them.

For example, this video's 0'28" to 0'31" and 0'34" have strange sounds.
https://youtu.be/PRFwp1TvUI8

I don't know the way to solve.

Sorry poor English.
Thank you,

Kanako