Yes, something is very wrong here. At 8:40 a.m. everything was at zero. So 500 pieces should be gone before Mr. and Mrs. Swiss have drunk their coffee... I feel a bit fooled!
The product of the day is always posted at 0:00 on a new day. With such a popular item as a powerbank, I'm not surprised that 500 pieces were already gone before your coffee. In my opinion, the only thing that's wrong is you. So next time get up a little earlier. Then you won't have to cry over your coffee in the morning and maybe you'll even get a croissant to go with it...
Otherwise, you are welcome to contact the customer service and hope for an explanation there, and then you don't have to abuse the question function.