volume of a MIDI track going up or down at certain points

[chihiro1000]

I'm having a problem with the volume of a MIDI track going up or down at certain points.
I checked the notes that changed volume and confirmed that this was not a velocity issue.
It's not due to automation either. Because my project didn't use it at all.

I found an old thread in 2020 on the same issue.
This.

I created another track, pasted the MIDI in question into it and played it, but it didn't work. The volume of the new track will change in the same place.
I suspected a VST problem and tried another VST. The result was the same. So you probably have a problem with your Cakewalk or MIDI track.

Is anyone currently experiencing the same problem? And is there a solution or workaround?

Vession : 2021.06 (Build 058, 64 bit)
OS : Windows10 Home 64bit (10,0 Build 19042)