through testing I found out that there is an issue with the combination 'MD_Slider' in the theme and the EU Cookie compliance module :
- when there is a MD_Slider on the page, the EU Cookie compliance popup shows but immediately goes away again, as if I clicked on it (but I didn't)
- when I remove the MD_Slider from the page, the EU Cookie compliance popup works as it should.
This issue is also described here:https://www.drupal.org/project/eu_cookie_compliance/issues/2504011
You can experience the behavior on my testsite :
I use MD_Slider module 2.21