Hey!
First of all, congratulations with the release of Liftoff! Nice that you decided to create the apps' community on Lemmy.world and that it is the default instance :)
I came across a bug where when I want to see the Top Day posts for my subscriptions it would say "no posts". I added a screenshot.
I checked the GitHub but there doesn't seem to be an issue report about it yet.
Edit: it's actually doing this for all options under "Subscribed", so not just Top Day.
It's doing this for me too.
I have to manually select an option specifically under my instance name to get posts to show up every single time I turn on the app.