Your civil rights have gained small rises recently (most recently on the 23rd and, previously, on the 21st of this month -- when they
did rise with no rise in your political freedoms).
When any of your freedoms approach either extreme -- either higher or lower -- you will notice that the magnitude of your changes becomes smaller. This is simply the way stats work.
However, you are still receiving changes in your civil rights.
EDIT: For more information about the stats, please see the
OP of the Unusual Effects Thread, particularly:
"Why did this stat change by X%? That's too much / too little!"