Because IPFS is still in development, some features are not stable.
When uploading your website, please do NOT use the following way to add your static website folder:
IPFS –> Files -> +Import ->Folders
It will end up looking like this:
It will lose your site directory structure and your site cannot be accessed.
A simple solution is just to drag and drop your folder to the IPFS.
And it will look like this: