The reason. That makes gravitation travel the "wrong way" can be found in the center of protons and neutrons.

The base diagram of protons and neutrons is that they are forming of three quarks. The structure of those particles is much more complicated than those three quarks. 

We all know that gravitation is its wave motion or radiation. And the gravitational radiation seems to travel the wrong way. That means. There should be some kind of gravitational version of the low-pressure area in the material. That thing can be the quantum-size black hole in the middle of all particles that have mass. 

In that theory, the key element is that the superstrings are the radiation of the quantum-size black holes. If that quantum-size black hole is small enough, that thing can roll the superstring around it like a yarn ball. 

So there is the possibility that the thing that causes gravitational wave motion to travel to the material can be found in the middle of protons and neutrons. There is the possibility that graviton is the small-size quantum black hole that collects the quarks around that point. 

If those quantum-size black holes are real and if quarks are forming entirety called protons and neutrons around them. That thing could explain dark energy. There is also the possibility that the gravitational impulses from some super energy phenomena can form when those quantum black holes are forming entirety. 

There is a possibility that cosmic inflation causes the gravitational radiation travels to the material center. Gravitation is a thing that is different than other forces. So there is one possibility that can make that thing possible. 

When we are looking at the image above this text, it shows how quarks are in the proton. When the quantum field around those quarks expands or the quarks are oscillating. That thing will cause quantum vacuum or quantum low-pressure between those particles. 

There is the possibility that the gravitational wave travels just through the middle of those quarks. 

And that electromagnetic low-pressure can pull the superstrings that form the gravitational radiation to material. When we are thinking about the form of material there is the possibility that gravitational waves are traveling just through the middle of those three quarks. 

In that case, the gravitational radiation could be like the pike that can travel through the quantum fields of the protons and neutrons. That means that thing is the reason why the gravitational interaction is so weak. 

https://www.desy.de/news/news_search/index_eng.html?openDirectAnchor=829

Image: https://en.wikipedia.org/wiki/Proton