Bent or overloaded axle or could also involve weak springs.
When you look at the springs, they should have an upward curve and when you look at your axle it should have a slight upward arch in the middle. If springs are flat and/or the axle tube is straight or bowing downward in the middle, that will be your culprit.
Pay no mind to the broken spring hanger, but look at the axle tubes and you can see how they are “arched”. (This is on my Passport that I sold earlier this year). If you zoom in, you can also see the curve of the far multi-leaf spring stack.
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