Since I do not understand the language on your site, it is a little hard for me to help, but here are some things I have done by mistake that kept posts from showing up:
1. Thought I clicked Publish but really clicked Save and post became a draft.
2. Accidentally edited the date to a future date and post didn’t publish until later. I have also accidentally chosen a very old date so the post went to the bottom.
3. Thought I had chosen Write | Post but actually chose Write | Page. Post showed up as a page.
4. Forgot to select category so the post showed up but in the wrong category.
I hope some of this helps.
My site is https://www.FastMovieReviews.com