Everyone really needs to take a good look at their history
Exactly that.
@Everyone, I have purchased (so far) ~250 cards this weekend, utilising this excellent offer. Due to these reports of missed cashbacks I decided to check how things were with me.
Please take a look at the three screen captures I made:
PIC #1: I had to browse until page 6 in my account history, where I noticed that there were 8 purchases listed without any cashbacks in between...
PIC #2: ... BUT when I made it to page 7, I found one seemingly "extra" cashback (after buying just one Aika May's card)
PIC #3: ...AND on page 8 there was another situation where it seems as if I got an extra cashback after buying just one Ria Rodriguez card.
I assume there this therefore another section of 8 or so cards without cashback, but I really didn't need to check any further.
All in all, the account history / cashback doesn't seem to happen strictly chronologically. If you suspect errors, I suggest you first go through your account history
even beyond the point you notice your first problem, to see if there are these "extra" cashbacks to even things out, before you conclude that something really is amiss.