<p>I can't reproduce here with either a GTK+ 2 or GTK+ 3 build with "DejaVu Sans Mono Book", although the underscore is well below the other letters, and I've definitely hit this issue before at some point.</p>
<p>Seems to be <a href="https://www.google.com/search?q=dejavu%20font%20underscore" rel="nofollow">fairly common</a>, maybe it was fixed in <code>fontconfig</code> or <code>fonts-dejavu</code> or something (<code>fontconfig</code> v2.12.6 and <code>fonts-dejavu</code> v2.37-1 here).</p>

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