Hi!
My best guess is that the theme stylesheet overrides the input style. Try to add the following CSS to the search options “Theme Options->Custom CSS” tab field(http://i.imgur.com/ns4vcKl.png):
[html]
.probox .proinput input {
border: 0px !important;
border-radius: none !important;
background: transparent !important;
box-shadow: none !important;
}
[/html]
After saving the options, it should appear correctly I guess.