add post category to the menu

When I add a post category to the menu, and go back to test it. It is added to the menu but it does not display the actual posts in that category.
For a test I have added three post categories to the menu, only one shows the actual post within the category, the other two categories did not work.
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I was able to Fix it! changed permalinks to post name, now the posts show up in the post category that is in the menu.