I am just a newbee to Drupal (2-3 months) so I have almost no idea about Drupal API but I guess problem occurs when saving nodes because I was able to see my previous nodes (ones created before loalizer installation)but after installing loalizer new products did not appear. I checked ubercart tables and didn't find any obvious diffrence. So I think übercart does not update loalizer tables so when products listed on frontpage localizer keeps them showed since übercart nodes does not have localizer data (language etc.) forexample in my situation propably my products don't have either english or turkish language attached to them so when my produts displayed in english localizer hides them since they are not in english and hides them in turkish display since they are not in turkish also.

Whatever as I said before I am new to Drupal