Different users have the same device white listed for them. Checking/unchecking "Control as Type" flag for one of user results in applying the setting to all users.
Settings like 'Control as Type' and 'Reinitialize' are applied to devices, not to users. Hence changing this option applies to all users a device is white listed for.
There is no way you can set different 'Control as type' values for different users unless you use two records for this device as a workaround, i.e. an unique device record for one user/group and a device model record for another user/group.