You can completely ignore this and don't have to worry. "Subscribed" and "Subscription pending" both mean you are subscribed to the community and posts from the community will show up in your Subscribed feed either way. The only difference is that "Subscription pending" basically means that your subscription status for that community has not been 100% synchronized on other instances across the fediverse. This doesn't affect you at all (you are subscribed to the community either way) and I think this is something that will be less confusing in a future Lemmy update.