Ok, now I understand the confusion.I think that perhaps we (me and @creative) thought pure maple syrup was just the sap from the tree. Its not. Its processed in a sugar shack which is explained in the Canadian link I posted above. I think the word sugar just made it sound as if it was processed with sugar (which, in fact, is not the case). There are maple syrups which have added sugar too - but the word 'sugar shack' doesn't denote that at all. And I learned something today!
I hope we got to the bottom of this!
You were reading sugar as cane sugar which is one type of sugar.
I read sugar in sugar shack as the place they boil down the sap to extract the natural sugars found in the sap.
So it is a different type of sugar but still a form of sugar.
And to confuse you even farther, you can also get sugar from certain beets.