yes, there were some surprises to me there. I suspect that it's a cooking ingredient in Satay sauce for the top countries. Not on e.g. sandwiches as in the USA.
You said "Peanut Butter is not a very common food, except in the USA", and my comment was an anecdotal point that it's a common food in the UK too. That chart doesn't contradict that. I'd imagine most households with children have some in their cupboard.
If you scroll down you'll see they do give context about the African countries. They're major peanut producers, and it's used in a lot of traditional cuisine.