Hyperextension of joints usually means you’re more flexible through your joints, which is not necessarily a bad thing, but it can sometimes lead to more risk for injury. Many people don’t really notice or have any issues, but if you are seriously loading the arm, you may want to be more careful.
The way to “fix” it is super easy- during a move where your arm is straight and there is weight going down into it, such as a split grip with your right arm on the bottom, just slightly bend the elbow! By bending it, you’re no longer resting through the joints, and instead you’ll use your muscles!
I have hyperextension through the knees, just enough for them to get mad at me if I lock them (as in, fully extend the joint) too much. Since that’s basically how I learned to stand, it’s a long process of learning not to do it! But, I’m not doing too badly.
If you never find it is a problem, I wouldn’t worry too much 🙂