I can't add more stamps to my profile??

I tried to add a few more stamps to my profile but for some reason, they're just not showing up?? The code is in the "about me" section and I've made sure that they're in the right place and that the code is correct but nothing. I also refreshed the page and tried putting the code in again and again but no such luck. I've never had this problem before, does anyone know how to fix it?