Hi,
after updating to 3.2.0 we had the same issue. It's not so much a bug, but likely because you have an older view override which does not work correctly anymore with the recent changes.
If we're not mistaken you have a view override of the file listing.php. In order to get rid of the double title, in your override you just need to update the line
if(!empty($title) && JRequest::getVar('hikashop_front_end_main', 0) && (!$this->module || $this->pageInfo->elements->total)) {
to
if(!empty($title) && hikaInput::get()->getVar('hikashop_front_end_main', 0) && (!$this->module || $this->pageInfo->elements->total)) {
and that should fix it. Hope that helps.