Impostor syndrome is when you don't feel you deserve the praise people give you, so the more praise you get the easier it is to feel impostor syndrome. So it isn't strange at all that successful people who gets a lot of praise feel a lot of impostor syndrome.

What is strange however are all the people who thinks they have impostor syndrome even though nobody thinks they have done anything great at all. They don't see themselves as impostors, they just see themselves as nobodies and feel bad about that.