Like Julie said, there are a few issues that can lead to this and you would have to be assessed properly to determine what approach to take.
However, in the majority of cases "even hips" will be due to muscle imbalances. True leg length differences are very uncommon and most likely, any true difference is going to be negligible. Many times people are diagnosed with true leg differences when they in fact have muscle imbalances.
Good news is, you are on the right track.
Uneven hips is usually caused by an imbalance between your right and left hip complex. There are many muscles that can contribute to anterior pelvic tilt(usually, but not always, tight hip flexors). There are many muscles that can contribute to posterior pelvic tilt(hamstrings, lower abdominals, etc). If these muscles become imbalanced as far as the right and left side of your body, one side of your pelvis will tilt more in relation to the other side. When one side tilts either anteriorly or posteriorly more than the other, the result is uneven hips.
When your hips are uneven due to these muscle imbalances and you engage in functional movement involving your hips, such as a squat, you are going to put further stress/torque on your pelvis as you engage these hip muscles. In other words, as you flex at the hip, the tight muscle(s) is going to put more relative force on one side making your hips more uneven. The result of this torque is your lumbar spine rotating in the transverse plane(right or left) as your pelvis torques. Couple transverse spinal rotation with a heavy load and the result is an injured lumbar spine.
The key here is to figure out what your imbalances are and fix them. You can go to a chiropractor and they may be able to relieve you of the pain, but in most cases, this is not a permanent fix and you will continue to working out in the same manner and will continue to injure yourself until you address the source of the problem.
You will sooner or later have to get rid of your muscle imbalances. This is going to involve stretching/lengthening the tight muscles and strengthening/shortening the weak muscles. Muscles can be tight or they can be taut. This is why you need to be assessed to see if your hamstring is really tight, or if it is taut because your hip flexors are so tight. Without an actual assessment, there could possibly be other contributing issues as well.
I would strongly urge you to get an assessment by a qualified practitioner and go from there. This can lead to serious injury.
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