I am running Autocad 2019 Mac Education Version.  When I set different layers and then draw different objects on different layers (in different colors) the entire drawing changes all objects to the color of that layer.  For example, if I draw a blue circle in a layer called "circles", then draw a red rectangle in the layer called "red" the blue circle will also turn red.  The same happens if I again click on the 'Circle " layer the red rectangle turns blue.  What am I doing wrong or do I have something turned off?