Energy saver settings do not stick when set in system preferences

For some reason when I restore the default settings for the energy saver settings, the settings go back to a custom setting I set months prior of Display Sleep at 1 minute.

Here is what I am doing:

• Going to "System Preferences"
• Going to "Energy Saver"
• Pressing the button "Restore Defaults"
• Everything goes back to the default settings of Computer Sleep of 10 minutes and Display Sleep of 10 minutes and I close the window out.
• Problem happens: A bit later I come back to my iMac and wake it up, the setting is back to 1 minute of Display Sleep (which I did months ago, I no longer want that).

I have even locked the setting to prevent further changes. Which locks the settings in place like it should I believe. However, once the iMac sleeps and I wake it up in a couple of hours it switches back to the old setting I made months ago, 1 minute of Display Sleep, which I no longer want.

Thanks in advance for any assistance!