@fcovalls, please check/try these things:
Make sure each computer has a unique Voice Name value or is your default computer.
Make sure each command has a Voice field set.
If you have one computer that's misbehaving, try renaming it and renaming it back. That will force Alexa to re-create the devices.
Try changing your default computer from your profile page.
Confirm you see the Smart Home Voice Commands page to make sure you see it there. If you don't see it there, Alexa won't create a device for it, so troubleshoot that first.