A follower drop is a visible fall in your count. Three things cause it: a platform cleanup, a wave of real unfollows, or low-grade purchased stock expiring. The shape of the fall on your chart tells you which one you're looking at.
A cliff after a purchase is what refill guarantees exist for: report it inside the window and get topped up.
A sawtooth means the stock grade was the problem: re-running the same order re-runs the result. Upgrade the grade instead.
A slope is content feedback wearing a metric costume: no delivery product fixes it, and the honest move is looking at what changed in your posting.
The count isn't the only casualty. A shrinking audience full of hollow accounts also dilutes your engagement rate, which brands check harder than the count itself.
That's how a cheap order can cost more than its price: the volume fades AND the ratios remember. The full story, with numbers, is in what happens to engagement after buying followers.
Check whether the drop is yours alone. Purge days hit everyone: creator forums light up, chart tools show industry-wide dips. A shared cliff is weather, not a verdict on your account or your last order.
Check the shape: one-day cliff (platform cleanup, probably industry-wide), slow slope (real unfollows), or a slide after a recent cheap purchase (stock expiring). Each has a different fix.
No: drop tracks stock grade. Bottom-tier bot stock mostly drops; high-grade stock mostly stays, minus the platform's normal cleaning. See retention.
For purchase-related drops: better grade plus a refill window. For organic slopes: the answer is in your content analytics, not in any delivery product. Honest services tell you which is which.
Related terms
Every definition lives in the full glossary, and the services behind the vocabulary are on the services page.