They're modern humans in countries who drive on the left side of the road
Australians already do this 95% of us will navigate a large space anti clockwise. If you set up a grocery store and try to channel people into a clockwise rotation path, according to the experiment in the link people will actually climb through displays to get back into the familiar anti clockwise behaviour.
This correlates with what side of the road you drive on - Americans and Europeans go the other way. You are trained to keep left while moving forward, so will navigate any space keeping to the left and go around a block by turning left, which translates to walking counter clockwise around a large area.
Having previously worked in retail in over a dozen large stores I can confirm >50% of people would enter on the right and circle the store anti-clockwise down the side, or enter on the left and immediately squeeze through the queues at the checkouts so they could do an anti-clockwise circuit, rather then walk ahead and do a, gasp, clockwise lap.
Or - herd dynamics and eyes with unequal focal ranges.
As an alternative to bifocals, I can get glasses custom made to have different focal ranges in each eye. Eg left eye is very good at short range, right eye is very good at long range. It doesn't introduce blind spots, your still aware of objects far away on your short side, just to get a good look at them, you need to rotate your head slightly so your far-eye can see it.
Enough of your population have this naturally, or the glasses are common because they give microscopic or telescopic vision. When they get into a moving crowd they are more likely to see an opening in the crowd to their right than their left, the net result is when there is a group of people moving, they will tend to the right. This will produce a net anti-clockwise motion.