It’s due to the width in .header-image .site-title a
in your style.css file.
.header-image .site-title a {
min-height: 76px;
margin: 10px 0 10px 0;
float: right;
width: 200px;
text-align: right;
}
Change the width from 200px
to 148px
and the image itself will scoot over more towards the right.
Here’s how it currently looks – http://i.imgur.com/iGifccl.png
and here’s how it will look once you make that change – http://i.imgur.com/uIJprLd.png
Let me know if this helps.
By the way, this is the first time I’ve seen one of my themes using RTL. It’s looking good so far.