gridster only showing 2 columns

I am having a problem with gridster only showing 2 columns. I’m a bit new so what I mean is 2 columns of content with 1 area of white space in between. This is only taking up about half the space. I love the concept of gridster but would like to know what I could be doing wrong to make this happen. Thanks for your help and I look forward to your reply.

https://www.ads-software.com/extend/plugins/cbach-wp-gridster/