[Plugin: NextGEN Gallery] Galleries only display one photo per line

Here is a link to the problem:

https://mazda3revolution.com/mazda3-guide/four-new-2010-mazdaspeed-3-spy-shots-from-nurburgring/

For some reason the gallery isn’t displaying multiple photos across one line and is only displaying one photo on each line.

I did edit the website’s CSS and header file recently but I don’t know why that would affect Next-Gen Gallery because it uses its own CSS file.