Front page menu does not work after editing

My site that is being built: http://35.187.235.165/

After I renamed 3 of the custom links on the front page menu

“Testimonial” -> “Results”
“Course” -> Fees and Payment”
“Gallery” -> “Education Gallery”

they no longer response.

For example, if you click on “Subjects”, the front page will automatically scroll down to the “Subjects” section. However, there is no response for the above 3 sections.
I have checked that all information under Appearance/Menus and Appearance/Widgets are correct.
For example, for “Results” which is not working,
under Appearance/Menus, the entries are URL: #Results, and Navigation Lavel: Results
under Appearance/Widgets, the entries for “AT Testimonial Section: Results” of “Home Main Content Area”, the entries are Section ID: Results and Title: Results.

I have tried removing the menus and widgets entries and re-entering, but there is no difference.

In fact, it made things worse. If you look at the RESULTS on the front page, it has changed to white colour font, while the others are default black. The Featured Icons no longer display either.

May I know what’s wrong and how do I correct for these?