Need to vent...

Ashley • Mommy of an angel, step mommy to two monsters. Baby #2 due March 2016. 😍 All four have my whole heart.
So, I have two step sons ages 4 and 2, and they come back and forth every other week. Well they will be with their father and I for Christmas next week, so their mom and her husband had their Christmas the other day. She knew what we were getting the kids from Santa, and she got the same thing for them. From her and her husband. I know it's at two separate houses but it bothers me that she KNEW and got them the same thing. Am I overreacting or was that wrong of her to do?