Look at your front view and check out your knee position relative to your ankle. These should be stacked when you are firming up with your stride leg. The knee should be over the ankle and your shin should be vertical.
Your knee is closer to first base, your foot is landing open. If your foot lands open, you probably have an issue with your hips opening too soon which is preventing you from keeping your knee over your ankle. When the knee can't be over the ankle, energy is lost before it can travel up the kinetic chain. When the knee and ankle aren't stacked, energy is absorbed and dissipated rather than transferred to later be amplified.