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So basically the date is showing over the featured image, and if you don’t add a featured image you can’t see any date… I don’t think this should be normal behaviour honestly. Also the year isn’t displayed either. Why not add “published on …” below the post title like almost every wordpress site?
I also added a custom CSS string since I wanted to hide author, did you remove it?
Yes if you do not set the post-featured image the date is not visible. It is the same behavior on our test site. It is the default functionality of our theme. https://ibb.co/Qjp7Gbj
Also, I have added the following CSS code in Theme Setting -> Global Custom Css.