Hi tested you website, I think you can try this solution:
If Ajax Product Filter does not show filters or not show results for attributes / categories / tags if you’re using WooCommerce 2.6.x, please, follow these simple steps:
1. Update the plugin to version 3.0.6 or higher
If you have an active cache plugin, please, do also the following:
2. Go to WooCommerce > System Status > Tools and click on recount terms
3. Empty the cache (if any)
If still the filters do not show up:
4. copy and paste the following code into the functions.php file of your current theme:
add_filter (‘yith_wcan_use_wp_the_query_object’, ‘__return_true’);
Let me know.
Have a nice day
YITH