Just checked the other Seasons Golden Eggs the scores are also gone in:
Easter Eggs, Summer Picnic, Cherry Blossom. It’s funny because it only happens to Golden Eggs you get after 3-starring all levels. Checked these levels and they are still 3-stars… Will ask Rovio what to do about this problem and will post the solution (I hope) later. I’am still upset about The Big Stove, score was 282K, only managed 271K till now. Well, must keep on trying.