mp_product_name show unlisted & didnt read new css

hello team,
this is my 2nd message to support time. :smiley:
Ok, You can check my site at where i send this message.
i face my issue like this screenshot :
that was mp_product_name with css position:absolute;
and i add new at wp-content/themes/gridmarket/css/grid.css
as : position:unset!important;
but no changes happened, although with inspect element [firebugs] i did successfully.

I hope You can help me,