Happened to me once it sucks
You probably login on a client that didn't got the relays you used to use so it couldn't get the list of followers properly.

Since than I use Citrine a relay on the device just in case this could happen again.
https://image.nostr.build/f4a89384047145aed571a6903390e5dd37d58949dea253d7f849ac9cdf5640e5.jpg 

 thanks for the tip 👍  

 You can download Citrine here all you need to do after install the app is to add the localhost to relay list on the client.

https://github.com/greenart7c3/Citrine
 

 Add this on ralay 

ws://localhost:4869  

 nostr:nevent1qqsz06hwcdxyrusmh0z4hfhd5ytw6evshw0uth0t5z2u6xa5vm3uqrqpz4mhxue69uhhyetvv9ujuerpd46hxtnfduhsygp5v5df8yknf0uaqe8rnu7pp0h0wj679rn3psrnyschk6ruf27haqpsgqqqqqqs08v0ag