Issue can be reproduced by going to “interieur” (you see that it works until now) and going back to “exterieur” : most of the time, the gallery is broke at this point. If not, go to “interieur” again and it should be. Just try to interact with it and nothing happens.
If someone has a solution, because I’ve tried a lot of things and nothing works… I also tried with another plugin, and the issue remains. Odd !
PS: codepen link brings directly to the editor because the provided sharing link didn’t include the js plugins links.