Hello. My name is Michael. There are restrictions on the minimum size of the margins if you're printing on fine art paper. Printing paper allows much smaller margins. But, assuming that's not your problem, – do you have the canvas set up exactly as 11 x 14 in the application and, are you choosing the landscape orientation in the print dialog? To do this, when you print make sure you go to the file and then print so you get the full print dialog. (Using a print icon will not make this happen it will just try to print it). But, if you use the file print you should be able to then select in the native print dialog that you want it printed in landscape. If that's still not working for you, let me know with any other specifics you can provide and we can go from there.
By the way, we do have the ability to do remote support sessions at an additional charge if it gets to the point where you feel that would be helpful in troubleshooting the problem.
Can you please scan or take a picture of one of the results and then attach it here so I Can take a look at what the output looks like?