Gallery area is not working properly

Hello If you go down my page, www.vah.ch, until the birds come (latest pictures). If you now click on a bird there to look at it and then turn the smartphone from upright to across, for example, everything will be mixed up. I have placed a page with the NextGEN gallery on the gallery area. When turning the Smartvon, the gallery is then left. It's a problem from the submission. If I go to www.vah.ch/neusten-bilder directly, it works. Many thanks for the help. Heinz