Sounds like a gain staging problem.
Imagine this:
You have one single track. You make a copy of it. You play both together at the same time. It clips.
Why? Because they add together and are therefore louder in total.
Same thing happens when you have many tracks adding together. You have to reduce the gain of each track so that the sum total does not clip.
As has already been pointed out, if something highly dynamic then sounds too soft, either turn down the other tracks further and enjoy the dynamics or get a compressor to reduce the dynamics.