Bootstrap 4.5 Dropdown appearing as multiple links on iOS

When I try to load a dropdown list in a Bootstrap navbar on an ASP.NET page, the desktop version of the list loads exactly as it appears on the official navbar documentation, but not when loading the same page on an iPad Air 2 with iOS 13.3.1. Instead of loading the listed items in a dropdown fashion, they appear below the dropdown menu’s name. Just as well, the toggle “hamburger” button appears as a blank button.
Bootstrap 4.5 Dropdown appearing as multiple links on iOS