That is definitely no good at all! I actually saw the same thing happen this morning in my own instance of DIGITS through the web portal. While it was not showing up in the message log, I was able to tap on the Google Chrome pop up and it took me to a message with that wrong number. I just said hello and they said "who is this" so it is definitely a bug. I will send you a private message which you can check here so we can get this bug report filed for you.
This thread was the product of our fantastic collaborators during DIGITS Beta! As many terms have changed and bugs have been exterminated since the Beta launched, the information here may no longer be accurate. If you still have a question, please search our active threads or ask a new question in the DIGITS space!