Why am I seeing changes to my likes, follows or comments on Instagram?
If you notice a change to the number of likes, follows or comments on your account, it may be because some came from accounts generating inauthentic activity.
To make an account appear more popular than it is, some non-Instagram apps create automated likes, comments and follows. This inauthentic activity goes against Instagram's Community Guidelines. When these accounts are discovered, their activity is removed from Instagram.