Both my hedgehogs love flipping over there food bowls. Hedgehog do also tend to sick of same food over the years. Or he could just be bored! Some of them find it more comfortable to eat from the ground than in a bowl! The only thing you should worry about is if he doesn’t have interest in eating anything.
Tipping the food bowl isnt rare, my hog went through a phase of tipping the bowl, mostly because she was moving the bowl, once I found where she wanted it moved to, there was much less tipping of the bowl!
And some hogs just like eating from the floor or making a mess.
As said, you have nothing to worry about unless they stop eating.