[Plugin: Flickr Gallery] CSS formatting errors in displaying thumbnails & lightbox issue

Hello, please see https://www.thecougarden.info/blog_homemade/ and the lastest post. I am using the flickr gallery script on a collaborative blog, this is a heavily hacked theme so it does not call a header.php which I think may be the issue with lightbox not working? I am not sure if there is conflicting CSS code which is making the flickr gallery appear all in a row instead of in a grid.

Any help is appreciated!!

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