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mmh it seems that the textformat you used for your filter is not added to the code correctly
can you send your website address, /wp-admin/ username and password and a link to this topic to info@laytheme.com?
If you update lay theme now the duplicates should be gone!
Dear @GiuseppeMig
Maybe this help: http://laythemeforum.com:4567/topic/6350/filtering-projects-help/2
Project filtering i believe is on its way!
Hey now you can update lay theme and when editing a thumbnailgrid you can now check "Show Category Filter"!
If you use the fullscreen slider addon, make sure to update fullscreen slider addon and lay theme to make the addon work properly.