Exercise minutes are set to 30 minutes 3x a week if you don't change it. That would be 90 minutes. So you must have set 660 minutes yourself. You can tick what days you'll exercise and how many minutes per day you'll exercise - so you probably set that, and 660 is just the multiplication of number of days times minutes per day.
Never use minutes. Ignore minutes. Minutes are largely irrelevant.
The important thing is, are you also exceeding the goal 'calories burned'? That is the figure that is used to calculate your nutritional ranges, so it needs to be accurate. If you're exceeding it, simply change it. You can manually set how many calories you'll burn in a week, and you can choose a figure based on what you've tracked so far.
Deb, in New Zealand