Issues with header on mobile

I don’t currently have a logo so I just use text. However, on mobile it jumbles together and covers up content. I’m not quite sure how to fix it. It looks okay on pretty much everything bigger than portrait view on phones.

I’ll add a screenshot so you can see what I mean. The screenshot is from my nexus 5 for reference of screen size.

website is http://www.understandingtheman.com