@yuhans: Same thing for me, since 15 novemeber none of my allegro shopings got cashbacked, It's about 50 zł of loss on unconfirmed cashbacks, useless, I just switched back to letyshops. I contacted the support and they gave me no help, only well known info:
For a refund to be excluded:
check if your cart is empty before activating the Opera Cashback view;
activate Opera Cashback before available products add to cart;
do not add products from the Watched section to the cart (search for the product again, then activate the Opera Cashback function and add the product to the cart);
as a result of several actions from different factors, in order to solve chargeback problems, always make separate transactions for each of them;
place your order in one session.
Lol, I will not do such things to get 20gr xD Letyshops works without any of this sick procedures.