Prestashop Instance issue Checkout not working

[Mostcla]

### Describe the bug and add screenshots

I have made my prestashop website recently, everything is working good except checkout page. When you add product to basket (shopping cart), then personal information. You have to fill your details like name, last name, password...etc
Then you click on continue, there is the issue, nothing happens, not moving you to the next section.
Another issue, when you are registered already, and try to sign in, not happens. There is issue on Prestashop Instance!
I have recorded video and showing the issue, please watch it to the end!

https://www.loom.com/share/9bc620989f0343aeb29d15929c418c2e

### Steps to reproduce

1. You have to add any product to shopping cart (basket)
2. Then go to checkout cart
3. Personal information section
4. Fill your details (name, last name, password, birthday)
5. Then you click on continue
6. Here is the issue (nothing is working)

### PrestaShop version(s) where the bug happened

1.7.8.6

### PHP version(s) where the bug happened

7.4.30

[Justforshop]

Hi Mostcla,

I have the same issue, do you have already some answer from somebody?