Hi Archana, 

This issue doesn't occur on my test machine (a virtual machine Ubuntu 16.04 and matlab 2015b, please see the attached figure). However, I've met this before. Several factors may have effect on the rendering, including the type of graphic card, the OS, and the version of matlab. It is too complex to examine their exact relationships. I think one thing you can try is to switch the render from opengl to zbuffer in the global section of the option panel. It sometimes fixes some unexpected issues. 

Best,
Mingrui