Reply To: Nav menu link text

I just found another small issue which is very URGENT. on single type product which don’t show any dropdown for variation, the above add to cart button showing inline with quantity selector ( https://snipboard.io/Xmk3L9.jpg ) .

It should be showing below quantity selector like other variable products ( https://snipboard.io/9RS6A3.jpg ).

please let me know how to fix this asap. Thanks