Having trouble standardizing pages alignment

I'm new here so apologies if this is the wrong spot or I missed the answer somewhere else.

Pretty simple question. I built this website in Dreamweaver, coded myself but I'm having a issue with the pages aligning differently. They should all be dead Center but a couple are shifted slightly. I thought it as a margin error but they are all set to '0'. In fact as far as I can see everything is the same.

I've spend all night trying to get every page to display the same (bar content if course with no luck). Any help would be greatly appreciated. Here's the URL:

http://ift.tt/1PcQcwU

It's still a work in progress but I don't want to continue till I fix this and find out what the problem is. Basic I know, I'm not a programmer really.