Some Instagram users have seen their follower counts drop quite a bit yesterday, one user report that he had lost half a million followers, this is apparently down to a bug.
Instagram has confirmed that there is an issue with follower counts and they they are working to fix it, you can see more details below.
We’re aware of an issue that is causing a change in account follower numbers for some people right now. We’re working to resolve this as quickly as possible.
— Instagram (@instagram) February 13, 2019
The issue is expected to be fixed by around 9 AM PST today and peoples follower counts should return to normal.