Nextgen not working properly

Hi.
I downloaded nextgen Gallery a few months ago and it was working fine for some time. I checked my Gallery just recently and when clicking on an image it opens the image in a new window.
I cant just close the image or go left or right.
I have deactivated the plugin and activated it again but that didnt help.

Any suggestions are greatly appreciated.

http://www.privacyfencingperth.com.au/gallery/

https://ww.wp.xz.cn/plugins/nextgen-gallery/