Wrong redirection page on checkout

-- HikaShop version -- : 3.0.0
-- Joomla version -- : 3.6.5
-- PHP version -- : 5.4.45
-- Browser(s) name and version -- : Firefox 51.0.1

after checking out, the redirection url does not change to index.php as it should be, but the url stays like this and the 'index.php' gets added at the end, causing an 404 error. (/food-supplements/natures-plus/aminoacids/checkout/index.php)

Please advise,

Hello,

This result is quite normal, if you want go back to your home page, "index.php" isn't enough, you have to give more parameter to have the good Url, like this :
http://www/YourWebsiteUrl/index.php

Hope this will help you.

Regards