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Could be one of several things.
1. Axle or spindle bent out of alignment, or axle that has lost its arch.
2. Worn shackle bushings and/or shackle bracket bolt holes are worn out of round. Maybe even a broken shackle bracket.
3. Brakes at one end of an axle are not working, either due to one of the following: being out of adjustment, a wiring issue, or grease on the shoes and drum. When brakes are applied one end of the axle will be pulled back and make it out of parallel with the other axle.
4. Substantially more weight on one side of the rig will flatten out the leaf springs more than the other side of the trailer, thereby increasing the distance between centers of the wheels on that side, which makes the axles not parallel to each other.
I am sure that there are other reasons that this can happen, but these are a few that it could be.
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