You only need one instance of this pattern for it to work. Send the jpg I've attached to be used as the background image for your page. I also included the revised vector if you want to hold on to it.
Basically all you had to do was expand your fill pattern by selecting Object>Fill and then ungroup everything and eliminate all but one square. Find the size of that square and then reset your document size to match it perfectly. Center the drawing on the artboard (should fit exactly), and then do a Save for Web as a jpg or other desired file type.
Instead of Object>Fill, I meant for it to read Object>Expand. Sorry for the confusion.
Thank you so much!!! There were so many issues that I had to figure out throughout the project; I think my brain melted on this last one.
I really appreciate the help! I'll give it a go in the a.m.