Yeah, it's a problem with this new layout as I viewed it on my iPhone 5s a few times. I'll message the author of this theme if she can fix it. In the mean-time, I'll put back the older themes up (but the new layout will still be the default). For now, only the Mobile Version is your best solution for now
The new default option looks good on the Vita browser.
Also, every so often while using the Vita web browser, a cursor would appear on the screen. I hadn't been sure if this was a bug or something, not least since SCEA's own online instructions don't say anything about it.
So, I decided to run a Google search on it - and it turns out that you can bring the cursor up (and make it go away again) by using the Square button. (This makes it easier to navigate web pages with menu options that appear when you hover over them, like those here on the Nepboards.) The same option works in the email app, too.
I admit to be somewhat annoyed at myself for not having registered this earlier...