Agree with all of these comments. There’s a real phenomenon called restraint collapse and it’s basically that they have had to hold together at school all day and when they finally get home to their ‘safe place’ they can finally let it all out. Always have to tell myself to just ride it out
Another helpful thing I have found is trying to give them back some sense of control. They are told all day to follow directions so letting them have reasonable choices can help- ‘do you want the pink or blue cup’ ‘do you want to read this book or that one’, etc can help fill up their cup.
I also think an easy way to get them to share about their day is to do a rose/thorn or strawberry/lemon for the day. I always make sure to do mine too. Can open the door for good little convos about what made them happy and what was hard.