Design (css) issues of exported project in .php files

I have exported a project from Divhunt. Now my developer is working on the backend (using mysql, php) of the project to create the Tutoring marketplace website.
The developer has created the database and converted the extension from html to php for backend. Pages work fine including their css.

When I updated the design of some pages, exported the project and sent to the developer. When he added the new exported project into his htdoc folder then the design (css) of .php got destroyed.
The developer says that the issue is in the builder (css, js files etc).

Is there any issue in the builder’s css file or what possible reason can be there?

Thanks a lot in advance for the valuable response.

@Tariq

What’s your domain name so I can check exported files.

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