Gallery shuffles due to multilingual site

Hi,

We have created a gallery on our homepage with your awesome plugin. When it is in the default English mode the gallery appears as it should: https://www.theslctd.com/

However, when it is in the German (https://www.theslctd.com/?lang=de) or Dutch (https://www.theslctd.com/?lang=nl) mode, the shape of the gallery changes.

What could be the reason for the gallery to change when a different language is set?

Thank you in advance!