snowstar

You seem to have figured it out. Why not share your findings with the rest of the forum? 😉

Well the fixed CSS in your HTML may have something to do with it:
(Notice the 350 in height)

<style type="text/css">
        #ready_google_map_1{
            width:700px;
            height:350px;
            float:right;
            border:0px solid  ;
            margin:0px;
        }
        #gmapControlsNum_1{
           width:700px
        }
	#ready_google_map_1 .gmpMarkerInfoWindow{
			width:700px;
			height:350px;
	}
	.gmpMapDetailsContainer#gmpMapDetailsContainer_1{
		height:350px;
	}
	.gmp_MapPreview#ready_google_map_1{
		/*position:absolute;*/
		width:100%;
	}
	#mapConElem_1{
		width:700px;
	}
   </style>

You can override the plugin CSS by writing the same in an included CSS and adding !important afterwards. Like
height:650px!important;