Wake up sent over the network

I have an issue, I do not know if it is related to volumio or rpi4 or not but here I see that there are a lot of people with it knowledge.
So here it is
I have a ds Nas server based on xpenoboot on an hp server and work ok.
If the Nas is in sleep mode when I press the shutdown button(sw of phisycal push button ) on volumio the NAS wakes up, I hear the hdd drives starting to spin. I guess that a signal is sent over the local network…
I observed this behavior also on other devices, if I send a command the Nas awakes
Thanks for your support.

Also now when I have pressed the shutdown button rpi the Nas server synology wakes up,
What could be the reason?
Kindly please guidee to fix this issue.