That's probably a carry-over from how it worked on the desktop.
If you don't like this, what is your suggestion for how it should work?
In my mind, I wish closer to how they tend to work on a mobile device.
Select the dropdown, and small little popup of your choices shows up and check the ones you want.
After working with many clients it seems this is how a lot people want it to work. We have gotten many requests to turn our multiple selects into closer how they are rendered on Chrome on Android for example, than how they are done on the desktop by default. Of course it all depends on the situation for how the UI should be handled for selecting multiple things.
I like this! Me and my iPad thank you.
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