Mobile Version, Photos stay large

I noticed when viewing my website on my phone, all pages/images seem to shrink to fit the mobile screen EXCEPT for the Good Old Gallery images. They appear to stay the same size as when viewing on a computer, thus take over the phone screen covering up other elements, not allowing you to see the full image. How can I correct this?!

https://www.ads-software.com/plugins/good-old-gallery/