When my OMV box is scheduled to shutdown... it restart right after

I have my OMV running fine, the system logs show no errors etc...
I have OMV version is 1.6 and it is updated...
I setup a schedule job to shutdown automatically at 2 a.m. everyday in the power management and I setup in my computer bios to start the computer at 5 p.m.
I noticed the power management try to shutdown the computer at 2 a.m. but it restart right after... it doesn't shutdown 100% and I used shutdown command to in the scheduled jobs but the same result
I also tried to command like shutdown -h now or halt or poweroff in the terminal, it does processing shutting down my box but restart instant shutdown my computer.
I also tested in the GUI shutdown button and this works fine.

Any anyone knows why I have this problem and how to fix this issue?
I am not a linux guru or an expert so I would appreciate your help

Thank you

Yes, Realtek nic card

Yes, I found it!

I modified the bios, under the Power Management and I disabled wol and it works now like a charm.
Now I am able to wake up at 5 p.m and shutdown 2 a.m my OMV computer.
The wake up time, I setup in the bios to handle this part and the shutdown time, I setup in the WebGui. I configured the power management under scheduled jobs to handle shutdown part.

subzero79, thank you for your help! I really appreciate it!

p.s. I really like the OpenMediaVault product. The guys you who designed it... simply you did niece job. Thank you!