I checked it out; but, cannot see anything odd. Maybe it was just a fluke and will not happen again. But, please do let us know if you see that happen so we can check further into it.
One other thought (because I had this happen to me already) -- When you enter something on the Team Wall, be sure that you click the "Post Now" button to save it. If you use the return key on your keyboard instead of clicking that button, your post will not be saved...it just disappears. :)
Have a good night!