It looks like there’s some code that is missing or edited out of your CSS. Do you remember removing anything that looks like this? –
.header-image .site-title > a {
background-size: contain !important;
display: block;
height: 76px;
text-indent: -9999px;
}
Once I add that back in your CSS, it looks like this – http://i.imgur.com/thdGvGV.jpg
Here’s how it looked before – http://i.imgur.com/TA4hAn9.jpg
I went ahead and added the code in your CSS, if you need to remove or edit it just let me know.