Even spiders that have little to no visible wobble can develop wobbles later on in life. And vice versa with animals that have wobbles as hatchlings.
It is part of the spider gene.
No one breeds the train wrecks on purpose to promote wobbles. Those animals are often culled or fail to thrive on their own.
My personal theory: the genes responsible for the formation of the spider dorsal markings of the spider affect the nervous system. Similar to how Rhodesian Ridgeback dogs can have neuro issues due to the ridge on their back. Yay for the spinal column! >_<
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