Problem with filter variation attribute display result

hi

i’m using your filter plugin. i face some issue regarding product variation out of stock filter.
for example if i select filter in dropdown size 42c , it display all products with 42c variation also display 42c that is out of stock or not available
Below is the screen shots.
http://prntscr.com/bs95f6
http://prntscr.com/bs96r2
and site link
http://www.losha.pk/demo/buy/bras/

https://wordpress.org/plugins/woocommerce-products-filter/