The implied weirdness here is that Kurt and Minerva were so caught up in the move that they didn’t even notice that he wasn’t in sight.  As a parent and a recent victim of a move I can attest that it’s a confusing event and could easily lead to imprisoning kids with cats.  Or maybe that’s actually a feature…not a bug.

Of course it could be worse.  They’re really only one small step from a Home Alone movie, here.  And no one wants that, do they?