The issue you're encountering is due to the conditional logic tied to waterfall runs. Each merge column has an associated formula, so removing a single provider disrupts the entire waterfall setup. This is on our radar, and we’re rolling out an update soon to improve how waterfall logic works. Once updated, you’ll need to modify your waterfall setups directly in the settings. In the meantime, I’ve refunded your credits for this mishap, and recommend setting up your waterfall from scratch. Let me know if there’s anything else I can assist with!