That is weird - with a text header, it should be mobile responsive. Sometimes, with a longer blog title, it may be necessary to reduce the font size, but in your case, it's not even rendering correctly.
The site title for the mobile devices is controlled in this area of the stylesheet:
You could try changing the text-align: center to left. If that doesn't work, you might want to try the support desk for the theme.
The Pixelista (owner of this theme), has her own support here: http://thepixelista.com/support/
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