Am I missing something ? Content discrepancy between apps

I apologize in advance if this is a Lemmy thing that I don't understand but I've been noticing some content differences while using the Lemmy apps. I usually brushed those off as performance or API issues but I can't with this one.

I've been closely following Thunder's development so I was excited to see the nightly community but upon arrival it shows no posts and 5 subscribers. Checking from other apps I can see that there are 2 posts and ten times as many subscribers.

So is it an actual Thunder bug or a weird Lemmy feature ? I thought instances weren't supposed to impact content ?