Field Security Profile not setting checkboxes to read only. crm 2011

I have enabled Field security on 2 checkboxes I have on a my form.

Checkboxes: Security Override (checkbox) Financial Overide (checkbox)

I have created 2 Field Security Profiles (FSP).

Override Control

This FSP will grant assigned users the ability to read, create, update.

Override Read

This FSP will grant assigned users the ability to read.

When I tested Override Read with an assigned user. I was still able to click and changed the checkboxes. It appears as if crm is ignoring the Override Read FSP.

How can I configure the checkboxes to be read only using Field Security Profiles?