Variation Images Issue

I have added 2 custom swatches on my product (link attached in site information)
One is for 2 designs selection and one for 2 colors selection, which have led to 4 variations and I have upload 4 images for each variation respectively.
But while placing order, when I select one design and color, then it doesnt show the image of respective combination variation as a product image. Please guide.

If I select design 1 and black color then it should show black shirt of that design which i uploaded as a variation image