New PSOne modchip but backups not playing

[Jacy]

I just got my newly modchipped PSOne back from ModChipUSA and it plays my regular games fine but not the two backups I made with Fireburner.

First thing I get is a grey screen with a grid background and an option to choose memory card (there isn't one) or CD. I can pick CD, then the next screen has a bunch of controls that look like they're for audio playback. I can't select anything other than Exit.

Any clues what I might have done wrong. I'm not handy with a soldering iron, especially in something this small, so I had ModChipUSA do the install. They claim it was tested with regular games and backups so I imagine I've done something wrong with the burn.

TIA