Subway site nutrition info, Do I go off that?

I would go off what the company website says. A lot of food products on MFP are added by individuals and may not be verified. They can also be tailored to what that individual is putting on their food. 700 calories is likely reflecting someone's personal built sandwich and not what the meal would normally be made with.

Use the Subway website to build your meal, and add that to your personal recipe's so you'll always know that you're getting the right information for what you're eating.