Cart page products controller

[bacuri]

Hello,

I'm using module totautoaddtocart to automatically add products to cart (prestashop 1.6.1.3). It works ok but I have error in one situation:

• I'm adding product to cart and another product adds automatically to cart
• I go to cart and I remove this automatically added product
• checkout is set to one page checkout. I'm filling all data address, shipping and payment bankwire
• then I go to confirm page 
• from confirm page I go back to change data (e.g. shipping address)
• back on cart page (opc) automatically added product (removed earlier) appears again. But total sum doesn't contain price of this product. So total sum is ok, but product shows but shouldn't be there
• when I refresh page products in not present end everything is ok

What can be wrong, maybe some cache? I'd like to debug it. But I don't known where is controller responsible for getting and setting, smarty variable cart with products list.

Thx for any help

Edited November 27, 2018 by bacuri
Added prestashop version (see edit history)