You can lose cashback for many reasons.

It may happen that you bought it from your link but the cashback did not count. To avoid this, do the following:

1. Disable add-ons in your browser that you do not trust. This extensions can stole your cashback.

2. Try not to go to this site from other sites after you have switched from Rakuten. If this happens, go back to Rakuten and once again click on your link “Shop Now”.