Why can viewers still edit files in an organization plan

Has anyone encountered a situation where a file is clearly set as “view only,” but other members can still edit the file when they open it from the link. This has resulted in having many editors (which means we have to pay more :smiling_face_with_tear:
Does anyone know the reason behind this?
I am certain that the share setting is set to “view” and not “edit.” :sob: