Xbox GFCI failed while plugged into BE325R

[Anonymous user]

I'm just fishing for an answer to this since what happened is what I wouldn't have expected.
As posted in the title, I was using a BE325R as a surge protector. I had a few devices plugged in (DVR, TV, and an original XBox). Only the Xbox was plugged into one of the battery backup/surge protector outlet. The rest were just in surge protector outlets.
Recently, I ran coax through several rooms and into a wire closet, which I also had to wire for power. I didn't unplug the surge protector when I turned off the power to that circuit. My bad but since it's a surge protector, I expected that the devices should be OK.
When I turned the power on, I eventually noticed that the GFCI, on the Xbox cord was tripped. Attempted to rest it only resulted in it tripping again, whether it was plugged into the Xbox or not. This happen on other circuits in the house, so it isn't a grounding issue.

The question is, shouldn't the UPC have protected the Xbox's GFCI on the cord. Seems to me like the UPC failed to produce clean power to the cord.
Am I way off base here?

Thanks,E