2, walking posture is not normal, walking too fast will also lead to insoles running out.
The main reason is that the insole is too small, too soft or too slippery. The friction between insoles and shoes is not as great as that between socks and insoles, and insoles will run out of shoes.
Maybe your insole is too thin.
Extended data
Tips to solve the problem that insoles always run backwards;
1. Stick it on the heel of the insole with double-sided adhesive. Then, put the insole into the shoe, adjust it to a suitable position, and press it repeatedly to make the double-sided tape stick tightly in the shoe. Double-sided tape is often sticky, so it is still a good choice.
2. Sew a piece of cloth behind the insole. Insoles always run backwards, often because the friction of insoles is not big enough. So we can prepare an old cloth, cut out a small rectangular cloth with scissors, and sew the cloth on the back of the insole with a needle to keep up.
If you happen to have old rubber gloves at home, don't throw them away. They can be reused. You can cut a small piece with scissors, then put it at the heel, and then put the insole in the shoe. This method is also to increase the friction between shoes and insoles.
Buy a pair of thick wool insoles. Insoles always run backwards, and another reason is that insoles are too thin. If it happens to be in the cold winter, buy a pair of thick insoles and immediately solve the problem of insoles running backwards.