Hey Venkat,
first of all, thank you for the purchase!
The infinite scroll duplication is a known issue, and it is mentioned on page 12 of the theme manual among the limitations of the (currently experimental) infinite scroll feature. However, just some days ago I’ve started preparing a new version of the theme (3.1) which will contain a fix for this. In the meanwhile, you can download this archive I’ve prepared for you, unzip it, and uploda the resulting files into the theme folder (/wp-content/themes/Ikebana/), replacing the existing files. Please let me know if the fix works!
Sincerely,
Andrii / Satori Studio