Sometimes the muscle on the right side is much bigger on the left side, for example.
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If it’s size, it’s likely to be training differences, where one side has been targeted more than the other, probably unintentionally.
However, ‘uneven’ abs where the muscles are asymmetrical is most likely to simply be a result of genetics. The muscles ‘attach’ at points that can’t be changed by exercise; the places that the muscle fibres originate (begin) and insert (end) determine what shape the muscle will be and are determined by the genetic structure of your body. No matter how much you work a particular muscle, you can’t change where it attaches to the bone, a tendon, or fascia, and so your power over its shape is very limited.
There are a few medical conditions that could affect the appearance of muscles (scoliosis for example I imagine could have an effect), but the symmetry of abdominal muscles is effectively fluke. It doesn’t generally have any impact on their output, power or effectiveness.
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