Dimentio's real body was recreated when Akuro influenced Dimentio's Body. Now Dimentio's Real body is unstable because of the part of Dimentio in the fake body, his heart. Which was locked in the fake Dimentio's Body. So now there is a heartless Dimentio and a Dimentio with a corrupted heart. (P.S.: By heart, I mean soul)
I also wanted to give Dimentio a more insane personallity, so this also gave me an excuse for that. Now there is Akuro and Dimentio in seprate entities.