Storyline sequence drop-down question formatting issue

Whilst creating a sequence drop-down question I've noticed a formatting issue whereby some of the options in the drop down list are off of the page and cannot be selected by the mouse. All is fine in the first screenshot below when I'm using the second drop-down box but not so in the second, where I'm using the tenth drop-down box; scrolling with the mouse won't allow me to cycle through all ten options. I can however use the laptop arrow keys to cycle through the options but this is an untidy solution. As the rest of the screen is taken up with an image, putting the drop-down list in more of a horizontal format is not desirable. Am I missing something here? Thank you.