After checking and thinking, I came to these conclusions:
1: You have centering on.
2: As the Letter paper is too small it tries to prin to 2 pages.
Solutions, in order reasonability:
1: Get Legal size paper
OR2: Take centering of and print (will leave bit of from the other edge)
OR3: Reduce the size to (I think) 98% width wise (will screw up dimensions and maybe text will print blurry)
OR4: Order A4 size paper ( Expensive to ship to US)
OR5: Go to Europe and buy A4 size paper (expensive, but atleast you get a vacation!

)
So go with solution 1 or 2