UPS PC Wakeup Issues

After shutting down or sleeping, the UPS wakes the PC up.

PowerWalker UPS VI Series https://www.amazon.co.uk/dp/B000R3OZ9W

Power Supply is Corsair 1500W HXi Series ATX 3.1 & 5.1 PCIe Modular 80 Plus Platinum, Ultra Quiet (2035)

Max draw of the PC is 650W so don't sweat the draw difference

AC-Back is set to always off so that's not it

Wake timers are disabled
Hibernate and Hybrid Sleep are disabled

Windows has been set so no devices can be disabled by the system to save power

Peripherals have been disconnected

Fast boot is off

ErP is on

PowerMaster+ says "communication with the device has resumed" each time. Shutdown type is "Shutdown" and "Shutdown UPS" is enabled

Any ideas?