System restarts instead of shutting down when UPS switches to battery power

[Zd07]

Hello, I am trying to make it so my system shuts down when my UPS switches to battery. I have tried the commands: /sbin/shutdown -p now , shutdown-p now, poweroff, and leaving the command field blank, and it still restarts. My UPS is an APC Back-UPS 600VA and my system has a Core i7 4820K, 16 GB of DDR3, a GTX 960, and two 2TB WD Red Plus NAS drives connected to an HP IPIWB-PB motherboard. Help is appreciated, thanks!

*I know I already made a post about this but I forgot to put the UPS in the original post and it took the thread out of the unreplied category because I replied to my own post.