It's nothing to do with sharing... even if they are good at that.
If that happened to me, I'd be thinking that the childrens father could only be bothered to get one item, and I would feel it's lazy of him to to that... better no gift than one that can't really be shared at bedtime for instance.
I'd also be wondering if it was all "last minute" at the airport, and only one suitable gift was available.
I can feel your disappointment... coz you wouldn't have done that...
Hmmm, maybe in a quiet moment with him, ask what were his reasons ?
Maybe (if not feeling attacked) he will confess that he was caught on the hop, and now regretting only get one thing?
Like other pp, I can't help but think that this issue you have posted about is just the latest in history of irritations that you don't understand about him...
Try to keep yourself calm when talking to him, both to feel better about your own actions, and to get a more honest response from him.
Not easy being a parent, or a partner either, come to that !! 🫣