Best thing I can say is,,, It's quirky. I've had the same thing happen to me, then suddenly update. No idea why.
I think your score probably went up due to an increase in account ages, which happens once a month at the beginning of each new month. Score updates only occur once every 7 to 10 days, however. I will bet that you get the score alert this week.
btw, you are better off setting your target score to your current score exactly, not one point above. Setting your target to your current score will give score alerts for score changes in either direction (when they are checked every 7 to 10 days).
Score Watch doesn't work at all for me. It has been over a month since I have gotten an alert. Score went down, score went up, balances decreased, nothing, despite the proper settings.