Why doesnt ONE of my links in the footer work properly? [closed]

It is incredibly bad practice to hardcode urls, almost as bad practice as hardcoded menus.

I strongly suggest you research custom nav menus. It will save yourself a large amount of time in development, and support costs, and it’s something to demonstrate to your client to gain kudos.

Hardcoding menus is a major warning sign of poor code, and it reflects badly on you. Having said that not everyone is aware, and I understand this may be new to you, in which case I hope you find it useful.

The Hardcoded Fix

If you really, really, must hardcode things ( and all the little kittens that die as a result ), at least make it dynamic so that if your sites URL changes, so does the link:

<?php echo home_url('/produkter/vatten'); ?>