Dropdown Form Element Not Clickable

I built a pop up for a client, and during testing we discovered that the dropdown form element does not respond to a click when viewed in Chrome on a non-apple device. The dropdown works just fine on mobile devices (apple or android), and it works fine using Chrome on a macbook.

Any insights or thoughts on how I might fix the issue? I am at a bit of a loss.

you can see the pop up at https://bio.engr.ku.edu