After ordering 1 product, some random products are being added with this order, while there was only one product in the cart

My website in Laravel, After ordering 1 product, some random products are being added with this order, while there was only one product in the cart.and my website has guest user option, When a user visit website many guest users are created for him, even if he view 100 product then 400 to 500 guest users are created for him which i see from database. and it is increasing daily, can i clear this table daily Should?

How can I solve it, can you guys help me?
My website link: https://pinkwally.com