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Slider problem in hidden div

Hi all,

I have this weird problem that I can’t seem to solve, so I’m reaching out for some help.
On the homepage of this site:

If you scroll down you can see the logo’s of the different concepts. If you click on a logo, a div that was hidden opens up (is in a collection list). The problem I have here is with the slider on the left. If you click to slide 2 and 3 you will see a offset (margin) on the right of the slide…

Nothing I can do to fix this so far…
The thing is when I don’t hide the div’s, the problem doesn’t occur. So is this a bug or am I missing something?

Thanks a lot for your help!


Here is my read only link if you want to take a look: