Cupcakes, that's not going off the rails, if you're still within your weekly allowance that's absolutly fine. The fact that you pointed it all too is brilliant, please don't feel bad. You had a blow out but you're still within your allowance so don't fret - it's ok! Start today afresh 
justabout, glad you enjoyed your meal out!
I'm another who's good week always shows the week after, no idea why, always been like that. It also happens that if I have a bad week it shows the week after too 
Yesterday was, good I still can't believe I was able to eat what I did and not go off track;
0% greek yogurt with a handful of cereal, a spoon of syrup and some pomegranete - 5 ProPoints
McDonalds quarter pounder with fries - 22 ProPoints
6 Tuc crackers, 1 phili mini tub, 1 slice of bread, cucumber, peppers, cherry toms, 1 jaffa cake and one and a half cookies from Millies - 16 ProPoints
I also racked up 14 activity points yesterday (though I only logged 10) so even after all that and dipping into my weekly allowance earlier in the week I still have 25 weekly points left & 19 actvity points (won't use thouse though) just hope the scales don't object to any of that!