So if a 23 year old that lives on own and supports themselves while going to school, if the parents got the EIP I & II, they will not qualify for the EIP payments?

Scenario: Person is working and going to school. Parents do not provide any support for the 23 year old. The box for claimed by any one else is checked no. School is paid by the military and student. Was a dependent in 2019 as they did not work. Why is the return now showing as changed and removing the EIP payments?