Click/tap on the Follower button and it'll show you the real (possibly) number.
Discussion
Yes I did that but nothing shows up. That’s just in Primal, not in Damus (I’m still trying to work out which one to use).
Everyone's use case is different and so are their preferences. Use what works for you. If #Damus works for you, then use that. If it's #Primal, then use that. Whatever works for you. The main thing is, they all inter-operate. So whatever client you choose, you won't be left behind.