Footer sometimes floats to middle of page?

on my frontpage the footer is positioned at the bottom like it should be....but when i go to my contacts page it seems to float to the top.  Does anyone know what might be causing this? below is my current footer css style
 
.footerContainer {    
height: 80px;    
width: auto;    
 background-color: #3E3E3E;    
color: #959595;    
 float: none;
 }
...