Can not get it to work, just getting the normal gallery in my posts

I have been trying to get the plugin to work and have followed all of the instructions. However, when I create a new post and build a gallery in it using the wp gallery feature, All i get is the old style normal Wp gallery where all of the image display side by side and going down the page. How can I get this to work properly?

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