Whenever I look into my profile it shows that I have 15 Fast pass. But when I am reading it only shows 4 . Whyyyy 
Fast Pass
It because of the different types you have some would be for comic or for certain types of novels such as romance and fantasy if you want to get rid of them go tap on your fast passes until it shows which ones you have. From there if you tap on them they will show you what you can use each one on