instead of zooming variable feature image it zooming main feature img

in variable product. if a product option (like size – s,m,L,XL) is selected, the feature image appears of that variable product. when I try to see in zoom with “Zoom style” – “Window Right side” or “lens”. Its showing the zoom image of main product not the selected variable product. Different variable product images is appearing but when zoomed it is zooming the main feature image of the main product instead of the selected variable product. note with “Zoom style” – “inside” everything is working fine.