This isn't shocking at all, for anyone who has any idea of what "obesity" actually looks like. So many people will look at this graphic and assume that 20+% of Europe looks like the headless fat people they see illustrating every American news story about the "obesity crisis" - someone probably between 300 - 400 pounds, with a BMI well over 40. That percentage of the population is probably less than 0.5%, if that. (It may be closer to 2% in the US, but that's debatable.)
Because weight is still distributed mostly on a normal distribution curve, the majority of "obese" people are near the middle of the curve. You probably wouldn't look twice at most of these people; they would seem entirely unremarkable to you. You probably wouldn't even object to sitting next to them on an airplane. In fact, if they're people you know, you may not even consider them "fat." At my height, where "obesity" starts on the BMI chart I still wear "straight" (not "plus") sized clothing.
So...pretty chart. Whatever.