Issue with existing validation accounts after creating new ones under same parent

Validation accounts have stopped working even though all formulas are validated. They were functioning earlier, but after adding new validation accounts under the same parent, the old ones suddenly stopped showing data. The new accounts are working fine, but the existing ones are not. All properties remain unchanged, formulas are validated, yet no data appears in those old validation accounts.

How could adding new accounts under the same parent affect the existing validation accounts?