ComboBox component: need to click 2 times

I’m developing a quiz that uses various components (radio buttons, checkboxes, and comboboxes) for the user to answer questions.

Question 3 has two ComboBoxes. I’ve dragged them onto the stage (rather than creating them programmatically).

My problem is that the user has to click each ComboBox twice to get them to drop down. On the first click the ComboBox doesn’t open.

Interestingly, as I test, if I set navigation up so that I go directly to Question 3 (skipping questions 1 and 2) the ComboBoxes do not need to be clicked twice.

Any suggestions for how to overcome this need to click twice?