Piano volume won't turn down in logic X Pro

Hi everyone,
I have a problem that I keep noticing and wondered if anyone is experiencing the same issue. I have imported my midi file into logic pro x from irealpro.
When I try to turn the piano volume down with the automation, the piano turns down ok but when i stop and restart the track, the volume of the piano turns back up (even though the automation hasn't moved). I can do this numerous times and it keeps happening.

Is there a solution please.
I am running Mac Studio Apple M2/ 64GB on Sonoma 14.1.2 and Logic version 10.8.0
Time and help is much appreciated
Thank you
Lesley

Does deleting the volume at the beginning of the track in the event list work?