Thank you for your feedback.
I did the following test with your song:
I have import your midi file into Cubase
I have copy the song to USB drive then I play back on LP-16 and record the midi output of LP-16 into the same project in Cubase.
Here’s the result:
For me that’s looks identical.
Could you make sure your LP-16 firmware up to date? We have a new firmware from today (83956), please update your device and check it again.
In your case the issues happens in standard playback mode or playlist mode?