Advertising click costing more than bid

Hello, I have turned on advertising on some new listings and set fixed bid to £0.21. But some of the clicks are costing £0.65 which is much more than I bid, I have no other manual adjustments set. Do others see this issue? or know of what I am doing wrong.

In order to have your issue investigated, I recommend that you to open a case with the Sponsored Product team specifying:

  • the name of the campaing
  • ASINs involved

and then wait for their response.