Well... I think we all know where you are going with this question.
And it's a really good question.
As it stands at this time, it is unknown why mass causes spacetime to warp around it.
There are no theories nor models to explain that particular behavior that have any real standing.
If we did, we would finally have a working Theory of Gravity and may be able to Unify Relativity with the Standard Model.
As before, your particular wording in your approach is novel.
But one thing that is clear is that energy is not the term for the interaction between matter and spacetime. While we know quite a bit about matter and its properties, we know very little about the properties of spacetime itself. Other than that what little we do know is that it is very unusual compared to anything we know.