Understanding Client Credits Usage for Lead Enrichment Process

Hey team. Can you help me understand where all my clients credits went? https://app.clay.com/workspaces/206204/tables/t_27CDxQchNbEt/views/gv_Swo8Zd74jjm2 For context, imported an Apollo lead list with 80% of emails being valid. For invalid emails, we’re waterfalling 20% of the list to find the other emails. This amounts to around 2000 leads to be enriched and have an unlimited API with prospeo so not sure what happened here?