Defaulting board

I have my correspondence chess board settings to classic pieces and dark brown board.  Very often if I close out the site (NOT log out), when I reopen the site the settings go back to the default.  I save the new ones each time I make the change; so, it isn't that.  Does anyone know why this is happening or what I can do about it?

I'm not clearing anything, manekapa.  I don't know about my anti-virus program, but this doesn't happen every time I close my browser (I just about never log out).

Which browser are you using?

You might try Chrome to see if it make a difference.

It happens on both Chrome and Firefox.

Thank you both.  I'll do that.   Yes, I'm saving, RedGirlZ; it sometimes works and sometimes defaults.  I change it and save and then it will work and it won't.