CSS issues with responsive design overlapping

Hey there
First of all your web page is cluttered with too many css style sheets. Professional recommendation is to maintain few style sheets as your webpage defeats the purpose of creating css in the first place .The alignment and id’s would be recovered as soon as the web page css is made more organized .If you need assistance related to particular portion for correction or alignment, feel free to revert back as soon as possible.
Thanks
~Edwin j hoffer~

This is Drupal; I don't get to decide how many style sheets I get to use. Sorry.

I am not a drupal specific developer but I agree.  I found this that might help on that subject. https://drupal.org/node/510442

Back to your problem, you do have a mix of things going one.  As example, in
sites/all/themes/best_responsive/css/responsive.css?n490b0

@media only screen and (min-width: 768px) and (max-width: 959px) {

form#frmSearch > fieldset{
   position:relative;
   margin-left:-190px !important;
   margin-top:70px;
   width:250% !important;
   max-height:80px !important;
   z-index:10;
  }

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You have a mix of pixels and percentages.  Creating a responsive page is more difficult because you have to plan out not only for each media query, but in between as well when you are using percentages.  

It might be worth looking to start fresh and use a responsive grid/library like bootstrap http://getbootstrap.com/ or foundation http://foundation.zurb.com/

I found a plug in for bootstrap https://drupal.org/project/bootstrap.

It will make your life a lot easier as they have already figured out all the hard stuff.  You just need to add classes that account for small, medium or large screens on a 12 column grid.

Here is a good base explanation of how it works http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/CSS/Q_28406542.html

I started over again, with a clean responsive.css from scratch.  Still not sure what was causing the issue, but starting over again now, it's gone.

I've requested that this question be closed as follows:

Accepted answer: 0 points for katwill's comment #a40012380

for the following reason:

I was forced to start over, as there was apparently not a quick or easy fix for this.