Thank you for pointing this out. You can resolve this issue by looking in your 'adv_portal_recthreads_exp' and 'adv_portal_recthreads_lean' templates for this code:
<a href="{vb:raw vboptions.bburl}/{vb:link thread, {vb:raw thread}}&page={vb:raw thread.totalpages}">
And replacing it with this:
<a href="{vb:raw vboptions.bburl}/{vb:raw thread.lastpagelink}">