Page table of contents navigation does not work correctly

[viktorkombov]

The “On this page” table of contents navigation is not working correctly.

Page:
https://staging.infragistics.com/products/ignite-ui-react/react/components/grids/grids-header

Steps to reproduce:

1. Open the page
2. Click "FAQ" from the “On this page” navigation
3. Observe that navigation does not scroll to the correct section / behaves incorrectly

Expected behavior:
Clicking a TOC item should navigate to the corresponding section on the page.

[dobromirts]

Not reproducible