@Figuringitout1 My D did the same and withdrew her other applications immediately. However, I did have a brief elevated blood pressure moment when I thought “what if the portal was updated incorrectly, and she didn’t really get in?” “Would she be able to reinstate her other applications?” So of course I made myself feel worse for a few days by reading every article about admission notification mistakes from the past 10 years. 
Not a proud moment from this admission cycle for sure.