Second Slide is not showing (grey background)

Design help General
1

First of all: I have worked through all the posts and questions.

But I couldn’t find a solution that worked for me.

Its about the page “zimmer & preise”. Some pop-ups contain a slider with photos (no CMS!). The pop-up opens when you click on the image and the button.

However, only the first slide is displayed correctly. From the second slide onwards, only “invisible” slides appear or the background color is displayed.

I’m at my wit’s end.

Can anyone find the error?

Best Tim

PS: I just noticed that depending on the zoom setting in the Chrome browser AND which pop-up you open, it works sometimes.

Here is my site Read-Only: LINK

(how to share your site Read-Only link)

2

I had to put the “old” solution back online (CMS grid with link to the room subpage).

But here is a copy of the “faulty” modal: www.hotel-berghaus.at/zimmer-und-preise-kopie