The problem is in SMF, not in SEF Advance. After you click on the Quote link it redirects to:
/option,com_smf/Itemid,71?action=post;quote=6955;topic=1867.0;sesc=f2a051b6c91c10c737b956c94d1890f4
Of course, this is not a valid URL and that's why SEF Advance redirects back to /option,com_smf/Itemid,71/
I think it should be fixed in SMF rather than SEF Advance. It should not redirect to that faulty link, it should stay on
/option,com_smf/Itemid,71/action,post/quote,6955/topic,1867.0/sesc,f2a051b6c91c10c737b956c94d1890f4