Issue with Bootstrap XS Dropdown Menu

I am nearing the completion of the conversion to Bootstrap. All pages are converted with a sticky navbar and footer. Works great across all platform sizes. Only one small cosmetic/functional issue.

In the navbar I have included a dropdown to allow navigation across the site. At any size GT xs the dropdown works as desired (click anywhere other than the dropdown and it collapses). BUT... when the screen size is xs this is not the case. The only way to collapse the Menu dropdown is by selecting the Menu btn. Further, if the Navigation dropdown is 'down' a click will collapse the Navigation part but not the Menu dropdown part.

Here is a link to the test site: www.txfannin.org/new-site/. View the page using a sm-md-lg screen and everything works as it should. But not with a xs screen.

Any clues as to the nature of the problem?
jdadwilson