The number is unreliable in most apps, due to the nature of how pulling in the information works. For a more stable number try nostr.band or npub.world The latter will show a smaller number, but will likely include less bots.

The in-app Nostrmarket maybe?

Here's a reply I made regarding why follower counts are always wrong and they always will be:

nostr:nevent1qvzqqqqqqypzpde8f55w86vrhaeqmd955y4rraw8aunzxgxstsj7eyzgntyev2xtqyv8wumn8ghj7enfd36x2u3wdehhxarj9emkjmn99uq3zamnwvaz7tmwdaehgu3wwa5kuef0qydhwumn8ghj7un9d3shjtnzwf5kw6r5vfhkcapwdejhgtcqyrth5ge8kx4ledmn0cc8cursvd5fec59zur0s4635jv9m0qa975lzqresml