Poor or negative caster will ruin the natural self centreing of the steering wheels...ie try to push a tea trolley but keep its caster wheels the wrong way round, its impossible.
I'm rather surprised they could give any of the various alignments a green light if something as important as the caster is wrong, and something as obvious as one wheel being further back in the wing would suggest the caster is out by a large amount on that side.
As to what caused it is anyone's guess.
Some years ago we went to buy a low mileage approved used Landcruiser Amazon from a North London Toyota dealer, on the test drive we noted the steering wheel was at 10 o'clock with a slight pull to one side (i've had several LC's over the years and all have steered perfectly), which made me look closer, i found a new odd tyre sitting on the nearside front on a wheel that looked to be different age to the others, i suspect a hard blow into an object had shattered that tyre and wheel, but it takes a lot to knock an LC's steering out of true so obviously we walked away.
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