If your forum posts aren't nesting correctly, try this.
At top right in EtsyCommunity, click on your avatar...
From the drop down select...
My Settings > Preferences > (Preference Options) > Linear Layout > Threaded > SAVE
Yep!
I've done that, but it never worked
Perhaps your browser is set to not accept "cookies"? So each time you logout, then log back in, your preferences have reset to default each time?
But then, I'm no computer genius, LOL. And a chocolate chip cookie would be my preference anyway, but I didn't see that option available.