Research has found that the right side of our body is larger and longer than the left side by about 1.5 to 4 percent, so everyone has long and short feet. If a person is asked to walk in a straight line (as he thinks), then a circle will be formed at the end. That's just the way it is, so it's normal for two shoes to wear out differently.
However, if the difference is really obvious, it may be a spinal problem caused by carrying the shoulder bag for too long. If it is corrected, it will be fine.
It may also be a problem with the shoes (the laces of the two shoes are different in tightness, worn in different ways, etc.). Of course, walking posture also has a certain influence, but for this influencing factor we are basically discussing the wear and tear of the shoes. It’s only mentioned later, and it basically has nothing to do with your question~~