If you can reach the plug, do a "hard reset" by unplugging the receiver for 10-20 seconds.
If you can't reach it, then HOLD IN the power button on the front panel of the receiver for about 10 seconds.
The receiver will reset, go into a acquiring signal process (you'll notice the progress at the bottom and 2 always takes the longest), and then it will go into a program guide download which takes about 5 minutes.
This should pull your locals back down to their single and double digit channel numbers.
If this doesn't work, you may need to call Tech Support @ 1-800-333-3474. They will likely walk you through a system check and a check-switch.