At the AIS
in your case the yellow targets were moored and the green is moving, but yellow just says "no static data received". The black ball indicates "moored".
You might point to the chapter in the help file where all the different targets (shapes, colors, marks) are getting explained.
And if you wish to share the presentation so that others can work
on it then you should perhaps publish the pps and not the ppsx version.
Or an Open/LibreOffice formatted file.