Play mode toggle weirdness

Sometimes, when I’m in Play mode and click the toggle arrow to open an instrument’s properties, it will open all instruments’ properties, and likewise will close all of them if I click one instrument’s toggle arrow. Is this a bug or am I missing some setting for this?

It’s supposed to do that only when you hold Ctrl (Windows) or Command (Mac) but it does sometimes do it when you don’t have that key held down.