Try updating with the attached file.
In postbit_legacy Template
Revert the template back to default.
Find
Code:
<blockquote class="signature restore"><div class="signaturecontainer">{vb:raw post.signature}</div></blockquote>
Replace with
Code:
<blockquote class="signature restore"><div id="signature_{vb:raw post.postid}" style="display: inline-block;" class="signaturecontainer">{vb:raw post.signature}</div></blockquote>