Problems with page and post

Hi everyone. I have 2 problems. One, a page I’ve created doesn’t appear on the browser (negro.store/animales-negros), but it does on WordPress and has the link well. The another one is in a post first appears the content of another post and after that post.

I’ve modified the code, but only css and php a little, although creating comments to hide parts of the post as the bottom navigation.

Please, can you help me? Thanks! Regards!

The page I need help with: [log in to see the link]