Happy birthday Mach40! Hope you have a wonderful time meeting up with your daughters.
My guess, and it's just that, is that ExW is probably trying to be "nice" - or maybe out of habit for all those years - not thinking of the pain/anger/emotions it stirs up in you. I'd just say "thank you" and let it be.
And, yes...it's very normal to feel anger related to all this.
Me:39 Ex-W:37 M:7 T: 9 S:6 D:3 BD/IHS/Confirm EA/PA: Feb '20 OM1 affair ends: May '20 W/OM2 & moves out: June-July '20 W files for D: Jul20 OM2 confirmed: 9/2020 Divorced: May '21