flask is uploading unexisting html Follow

Hi, 

I started to create a flask project. I managed to create 3 html and everything look good. However, later on I rename one of them and I added more content to it. But when I ran the application again, it kept uploading the old version. I have tried to debug, clean history, caches and everything I possibly could think of that would create this problem. But it has not been resolved and still upload the old htmls.

Could I have some enlighten on this matter, please?