How to fix mobile back page error on my ecommerce site?

[JOYAS]

Go back page Mobile version goes back to the first page in the collection.

I need it to go back one page. 4 to 3 , 3 to 2. 
thanks 🙌🏼

 

 

my website: https://joyasjewelry.co.il/collections/טבעות