[Plugin: NextGEN Gallery] images go to url

I uploaded NextGen in this site that I am busy with. The thumbnails work fine on the post but as soon as you click on the images to enlarge the image and use the stroller, the image go to the URl where it is uploaded to.
Can anyone help with this.https://www.fionaayerst.com/photography-portfolio/private-galleries/cassie-and-bjorn-coetzee/

https://www.ads-software.com/extend/plugins/nextgen-gallery/