Whether or not the Matlab is running

I know that when the Matlab command window shows:'>>', it means you can type and run immediately. And when the '>>' disappear, it means that the Matlab is running. So we can tell through the '>>' that whether or not the Matlab is busy. However, it comes that the '>>' is on the screen but the Matlab is actually busy just as the figure shows below. Does anyone what happens?

[Image Analyst]

The figure does not show that it's busy. Why do you think it's still busy? And why is the iteration number 1 each time?