Category filter not shown

hi;
tnx for your great plugin.
but I have an issue by Categories in your plugin.
I was select category for filters in WOOF By Category and other attributes.
attributes works fine but category filter not shown in certain category that filtered.
https://screenshots.firefox.com/uuFSEeu0Arx832JY/datismart.ir
“دسته” means “category” in Persian. you can see that I was selected Category to show but in following link, not loaded.
http://datismart.ir/product-category/%D9%84%D9%88%D8%A7%D8%B2%D9%85-%D8%AC%D8%A7%D9%86%D8%A8%DB%8C-%DA%AF%D9%88%D8%B4%DB%8C-%D9%85%D9%88%D8%A8%D8%A7%DB%8C%D9%84/%D8%A8%D8%A7%D8%AA%D8%B1%DB%8C/
please help me

The page I need help with: [log in to see the link]