I just opened my easter egg hunt email today. That happened to me at first too. Each egg I clicked on opened a new DMR window. I clicked on all 5 eggs, which opened 5 different windows, then went to the last window and signed in. I got the points confirmation on that window only. I figured I needed to sign in on each window so I did, but it didn't work...said invalid magic code. Then I went back to the original egg hunt email and clicked on the eggs again. This time it opened up four additional windows and I got the points confirmation in each window. Sooooooo sign in to DMR first, then open the email and click on the eggs again. You won't get points for the one egg you already got, but you'll get points for the other 4. I hope this all makes sense.
I also only received 7 points with the Monster email. I never did receive the email with the Easter eggs this year but I do remember it from last year.