Hi Christian,
We recently released a new version of the Grimlock for WooCommerce plugin (1.3.1). Updating this plugin to the latest version should fix this issue.
If you have correctly updated, the problem should now be fixed. You might still be seeing the issue because your browser cache is showing you an older version of the page (browsers do that to load pages faster). So to see that the issue is resolved you will need to empty your browser cache and reload the page. If you want to read more on what browser cache is and how to clear it, here is an article that might help you: How to Clear Internet Cache in Every Major Browser.
Thanks a lot for your great (and complete) feedback :).
Best,