I've known about his since I was 12 and my theory then is the same as my theory now: humans are slightly heavier on the right half of their body by default.
Smithsonian Magazine
Researchers Accidentally Discover That Humans Prefer to Turn Counterclockwise. But They Still Have No Idea Why
The effect transcends factors like culture, gender and handedness, causing the scientists, who were initially studying social distancing behavior, to scratch their heads