There are always people who say that low-voltage electric shock sticks to people and high-voltage electric shock hurts people. Is this right and how to explain it?

It's just a personal hypothesis. It's a joke to say it.

Talking about low-voltage electric shock paste;

The intensity of contact current far exceeds that of human neuroelectric signals. Some parts will get an electric shock. Although people are conscious when they get an electric shock, they can't control the movement of their limbs. Looks like they're stuck.

About high voltage electric shock:

At the moment of high-voltage electric shock, human muscles contract violently under strong stimulation and seem to be ejected by electricity.