Hi
About the code map showing there, I removed it in the file: /templates/ja_diner/html/layouts/joomla/contact/masthead.php
<div class="google-map"> {jamap mode='normal' locations='{"location":{"0":"819 Mill St., Pulaski, TN, USA"},"latitude":{"0":"35.19134"},"longitude":{"0":"-87.046465"},"info":{"0":""}}' zoom='15' display_scale='0' }{/jamap} </div>
then I updated the code of OS map plugin:
<div class="google-map">{jaosmap}{/jaosmap} </div>
to show the map in same position.
If you assign the custom module with map to 'slideshow' position, the box will not display like demo site 🙂
I also updated this custom css on your site:
.view-contact .t3-masthead .contact .plain-style .google-map {z-index: 1;}
.view-contact .t3-masthead .contact .plain-style .container {z-index: 2;}