The 3 McDonald’s menu items’ calorie values displayed add up to the sum displayed; where is there a discrepancy of 100?

When it’s 1500 calories for one damn meal… Does 100 calories matter that much for something like an infographic? That’s my entire daily calorie intake in one meal. If I ate that 3 times a day I’d be 600lbs. It’s trying to demonstrate a point, that this is an unreasonable amount of calories for a single meal. Also different countries use different ingredients for the same fast food joints so the calories could vary that way. Also x2 depending how long the person making the fries holds it in the deep fryer it could affect the calorie count based on that. Or whatever it is they are preparing… the amount of sauce or mayo they put on a big Mac could be 100 calories difference, whether they added extra cream cheese or butter to your bagel, or poured more or less cream into your Starbucks latte.