Typically, a negative remaining holiday balance can show due to the following:
You allowed employees to exceed the allowance in the employees' planner settings.
To see the history of these changes, next to the planner settings, click the clock icon.
After your employee booked all their time off, you decreased their annual entitlement, resulting in a negative balance.
To check the entitlement history, in the employee's planner settings, next to the This Year field, click the clock icon.
If the employee has access rights for the planner set to "Update" then they will also have the option to exceed their entitlement.
If your instance isn't included in the above scenarios, get in touch with us and confirm the name of the employee and the expected and current holiday entitlement.
📌Note: Holidays added by admins will go auto approved and might create confusion when an employee has a negative balance because it was added by somebody else.
You can see who added the holiday by creating a query on holidays.