All that is, is a classic MIDI (not exclusively Reaper) error, where the note offs for those elongated notes have either got lost or been moved. Very common with importing other peoples MIDI files.
I renamed the .MID file to something shorter and more occidental in case it related to the Chinese characters, which seem to have no effect in this case.
It would be woprth looking in the MIDI event list editor to see if there are any control codes, sysex`s or other code items that you need to remove or vchange.
Pragmatically, go into the MIDI editor and hand-edit those notes to the right lenght, then save the project and it will be fixed.
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Ici on parles Franglais
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