Quantity field in Categories listing

Hi,

1. It's not the bug.
The HTML of the quantity input field is displayed on the listing on your page. It's your template which adds custom CSS in the file templates/lt_techshop/css/hikashop.css in order to hide the quantity input field area:
i.imgur.com/mFWmflC.png
i.imgur.com/rYcUiGi.png
I would recommend reporting this to your template provider. I don't think it's a good idea to force the quantity input field to not appear on listings.

2. You don't need to do a view override for this.
You can add custom CSS like this:

td.hikashop_product_price_row {
    min-width: 200px;
}