You said "caller ID history". Where? On a telephone plugged into the OBi? If so, that telephone is erroneously adding another "1" to the number, and you should be able to disable that feature on the telephone.
You can confirm that the phone is the culprit: pick up the phone, and press ***1 and listen to the voice tell you your IP address. Enter that address into your web browser, and log into your OBi's local web interface. Click on "Status", then "Call History" on the left side of the page. You should see the phone numbers of your calls, and they should have just one "1" in front of the area code.