Everyone has some muscle imbalances in their body. Some of us have a more severe imbalance issue than others, but we all have it in some fashion. It is extremely important to correct these imbalances if you want to be successful with your training.
I am someone who has very tight hamstrings. Unfortunately, I have neglected this imbalance and it is now causing me problems. As I go heavier on my squats I find that I am unable to get full depth due to the hamstring imbalance. If I hadn't noticed this I could have suffered a severe back injury. The hamstrings are pulling my hips underneath my glutes when I squat to a decent depth. That puts my back in a rounded position which is very dangerous. This is why I am now working hard to stretch out my hamstrings as well as my calves. Correcting these imbalances is the key to my future training.
There are many other imbalances that can cause you issues. Alot of people forget to engage their core when lifting. They forget that much of their power comes from their core. As a result of neglecting to tighten the core when lifting, they have a weaker core and that, too, can result in serious injuries if ignored. A core imbalance is extremely serious. Everyone should work to have a strong core. Correcting a core imbalance should be given alot of attention.
Finally, alot of people forget the glutes when lifting. The glutes and core work together on lifts like the bench press or squat to complete the move properly. They give you power to lift more weight. The glutes play a large role in the squat. They are the first muscles to be activated when squatting properly.
You should take the time to have your lifting technique checked out by a professional. Ask them to identify any imbalances you might have. Once identified, go to work correcting those imbalances for a better lifting regimen in the future.