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I just scroll down. A new post appears for a second. And it disappears and instead there is an old one at the very top.

Do the new posts appear below older posts, or new ones just disappear

new ones just disappear

Just like this. They appear on 1 sec and then I see only old posts.

Also,

BTW, there is another bug and I was not able to publish this comment on Ecency (web version), and I had to use another interface

What error message did you receive?