One of two option drop-downs is not visible in mobile mode

[Feltigo]

The page https://www.etsy.com/listing/1526474609/margilan-silk-gauze-scrim-sparse has two drop-downs when viewed in desktop mode, but when switching to mobile mode one of them (Quantity) becomes missing. The browser is Chrome (both mobile and desktop).

[PillowDetails]

@Feltigo  I also check laptop and Buyer mobile app - I'm seeing the width and the quantity drop-downs.

However - on mobile (android) using the browser / desktop site, I see NO option to choose a width, and only can select a quantity after adding to cart.

This is not right.

[TinLizziAntiques]

In the blue Etsy Seller app, I can see both drop-down variations on my Samsung Android phone. I have not tried a browser yet.

[NanaLetha]

I see both on my iPhone 

[BagmakerSupply]

@Feltigo: This seems to be a (poorly implemented) CSS issue - when changing the responsive design mode in a browser the quantity box comes and goes depending on the device selected.