Slider does not work on (second language) Homepage

Hello!

I recently recognized that my english Version of the homepage has some missing pictures on the startpage/slider configuration. Due to this fact, it shows the preloading pictures all the time.
I know it interacts together with the plugin polylang, at least it has previously worked out fine. I don’t know since when it stopped doing this.

Has anyone faced this problem as well?

Thanks in advance
Thomas Goo