That's weird, I've been using the two numerical codes for days now, and haven't entered any of my "real" points (because I'm lazy and let them pile up then do them all at once.)
So I tried the "WorldRecord" code, it said I was maxed, I added the numerical codes again next, just fine, no problems..
I'm getting the same error and since I have a total of 110 points in my account (and haven't redeemed anything) I'm 100% positive I'm not over my 120 for the week.