I think you have "hide read posts" turned on in eternity app itself. I was having the same confusion and ended up double posting by accident because my profile in eternity showed empty. So check, not in lemmy profile, but in the eternity app.
Eternity
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I do not. Even posts I haven't looked at don't show up.
You have to disable "hide read posts" in the settings on your account.
I don't have that enabled.
Just to be clear: I'm not talking about eternity settings. I'm talking about a setting you can only change from the web version of your instance. In your case, you have to go to https://lemmy.ml to change the setting.
I do not have that setting enabled and never have.