Hi,
However, please try go to file: app/code/local/Sns/Producttabs/Block/List.php check and compare with http://monosnap.com/image/uh0p1dqiBZrkZcK8EzGKhxfbQQEnka#
I think i understand issue now. And please read my reply above
==> Please go to that filve above and compare code
Thanks!
