Keyword not ranking!

Hi,

I have been using an Amazon search URL including my keyword.

I have had a sustained spike in sales Friday, Saturday and Sunday this week but my product hasn’t budged at all from page 11.

I believe it should have moved from page 11 down to pages 3 or 4 by now at least, based on previous movements.

Normally keyword ranking seems right up to the minute and is immediately effected by sales like the Best Seller Rank is.

Should there be a delay?

Am I doing something wrong?

My Amazon search URL I am using in my Facebook campaign hasn’t changed whatsoever.

Any help appreciated.