It's likely that your text within these widgets are a bit too long.
There are a couple of ways to solve this:
1) Remove one of the text widgets
You can do this in Appearance > Widgets - "Header Details" and delete a widget you don't need. This will free up space.
Deleted one by accident and want it back? Don't worry! We have a solution for that.
2) Remove the search
If your site doesn't need a search bar you can remove it within Theme Options > Header Settings. This will free up space.
3) Simply add a break within the widget content to make it go onto 2 lines
Just add a <br/> tag within your widget content to create a line break like so: