I don’t know how to explain the problem but i will try.
It’s my , i have changed my menu, when you move the mouse for example on the main menu button then background change with orange image but when you push another button for exmaple about us and rolls the mouse with a button the background changes to gray as you can see in the above image. I used “Simple Custom CSS” plugin here is the code `.main-navigation .main-nav ul li a:hover,
.main-navigation .main-nav ul .current_page_item > a {
background: url(‘http://127.0.0.1/wp-content/uploads/2015/09/menu_hover22.png’) repeat-x top center;
border-radius: 0 0 20px 20px;
}`