Opt Exclude “Out Of Stock” feature resulting in Product Slider display strangly

Hi,

I set up a WCPS slider (Value Meal Dishes) , query by categories, it been tested & working fine.

However, I then try to follow the tutorial to exclude "Out Of Stock" items, but strangely instead of excluding the products which is out of stock from the slider, the slider adding additional products which is not belongs to the categories.

Once I disable exclude "Out Of Stock" items, the slider behaves normal again