Don’t worry, you’re still going to get the number of influencers you asked for!
However in order to account for influencer drop-off, we usually need to achieve 30-70% more campaigns opt-ins than posts needed. For example, if your campaign size is 200 posts, you may see around 400 opt-ins (about 50% of influencers will end up not posting).
You will still only be charged for the completed posts you signed up for!