Midi volume automation when there was none

[smlworld]

I've been working on a session for a few weeks. i was editing a midi piano track.
i tried to re record it but watched K2's piano inst volume go from 90 to 30 to 0 on the same note.

I checked the velocity. It was okay.

I checked ALL parameters of the midi track. (volume, modulation, etc) There was NOTHING there to play that measure like K 2 was playing it.

I started to PANIC.

I reset the input in K2 and PT output to midi ch 2 - and all played fine.

I didn't try restarting K2 or PT.

is this something that's an issue or just odd? Or do i need to do something to prevent this?

thanks