Could someone explain to me as to why I am getting distorted or clustered of selected menus when I select a specific menu item?

Refer to the following link and select on one of the menu items and you will see concisly what I am trying to convey.

http://www.atechsolutionsgroup.com/

Thank you in advance for your assistance and support.

tercasward@comcast.net
terry.ward@atechsolutionsgroup.com