Subpages not showing properly

I have a navigation bar and all the subpages are showing at the back of the post. I just want that the subpages were ON the top, not at the back.

Here’s a picture:
https://img70.imageshack.us/i/dibuix2.jpg/

Also, I can’t navigate more than the first 4 subpages, when I’ve tried going down… It disappears. Take a look, please:

https://www.carles.cat

Thanks!!!