Smart Pad not working

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The issue can be found here: https://www.pcbuildersclub.com
The preview works: Yes
It works with other themes: Haven’t Tried
It works when I disable all other plugins: Haven’t Tried
Meta Slider version: 3.5.1
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Hey there!
I’ve got a huge problem with Meta Slider. I installed the plugin to create slides for my tech site mentioned above. I use these sliders in a lot of posts, also in this post:

https://www.pcbuildersclub.com/2017/07/benchmark-von-rx-vega-bei-3dmark-firestrike-gesichtet/

When I posted this news post with smart pad enabled, the slider worked perfectly. It added paddings to all images to show them in the full resolution on the space I gave them (678×381 pixels, the width of the page). When you look now on this images, they are getting cropped and the slider changes its height often. In the preview directly in the slider it all works perfectly, also with other sliders.

Can anyone help me?

Best regards
Florian