All functions in the one-page setup are working just great. It navigates, as it should, on all menu-buttons.However, on the landing page, the button-indicator is on the portfolio-link, not the landing page-link.
This is a known issue, and I’m currently finalizing a theme update to version 1.4 that will among other things include a fix. Meanwhile, you can download this archive, unzip it, and upload the resulting file into the theme folder (/wp-content/themes/Kanso), replacing the existing file. Please let me know if the fix works for you!