Yeah, you can't rely on clients to count your number of followers, they would need to parse every contact list on all nostr relays and add up all the ones that have you in it.. you can imagine the phone trying to do this is not going to work.. only aggregators like nostr.band or primal stand a chance of getting this number for you.
Discussion
I am talking about my own contact list, not my followers.
Ah, ok then if you're seeing differences in the clients this can be bad.. (don't click follow). It's your set of relays is different and if you aren't connected to the right ones you'll lose follows.
If you want a command line tool to help backup or potentially rescue your contacts you can try this one I wrote.