I thought about the plugin issue as well though have not tried to deactivate some to try to find the culprit. I am going to see what plugin could be causing it.
This is one of the posts: el blog salmon ; there I can see the category and tag in the view-source but not the date because I disabled it in the customizer yesterday.
Leo has given me the solution for the date issue in another support thread: remove post date. I applied the code in another web I have and it worked. I will apply it in this eventually as well.
Anyway I still have “category”, “tag” and “navigation” clicked in the customizer and can not see them in the front end of the posts.
Thank you