You could very well be right. Depending on your weight, athleticism, and how much you move, it could take an hour to burn off a Kit-Kat bars worth of calories, that’s pretty normal

Someone more athletic can get more movement in during that hour so they could burn off that Kit-Kat faster

Where someone less athletic probably gets less motion in during that same hour so it would take them longer, the entire hour or more, to burn off that same Kit-Kat

But moving more an eating less grantees you will lose weight because the laws of physics will not allow you to spend more energy than you take in and still keep or produce more mass