VFB does not display drop-down menu properly on iPhone

The drop-down menu, “Suggestion or Comment?” works well in browsers on both PCs and Macs, but not in Safari on my iPhone 6 (v. 10.3.3), where it won’t drop down but instead displays some (sometimes) or all of the drop-down options in a panel at the bottom of the screen. Is there a way to get the drop-down to work on on an iOs device the same way it does in Windows 10 and MacOS Sierra (10.12.6)? That would be much more intuitive for users.

The page I need help with: [log in to see the link]