Many problems since the last update

Many problems appeared since the last update of the plugin and WordPress to 5.2.

– Galleries show only one image in a row instead of 4 as it is supposed to be.
– When I click on any image, the slideshow do not opens.
– The caption is not showing.

I have another website with almost the same installation and content but I did not do the update of the Photo Gallery plugin. You may see that it is working far better https://louiselamirande.com/galerie-des-techniques-mixtes-2019/
In that case, there is a problem with the caption on the slide show. When the slideshow opens, the description of the image appears in many rows. When you click on the arrow to see the next image, the description shows the html <br> code in one row.

Thanks for your help with those issues.

The page I need help with: [log in to see the link]