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This issue might be caused due to a few reasons:

1. Server-side issue: The server might not be configured to handle the request in the correct way or there might be an issue with the server configuration.

2. Content-Type issue: The Content-Type header in the request might not be set to the correct value or it might not be set at all. This can result in the server sending the layout of the page instead of the data in the correct format.

3. Encoding issue: There might be an encoding mismatch between the server and the client, which can cause the data to not be displayed correctly.

4. Cache issue: The data might be cached on the client side, causing the client to display the layout of the page instead of the data.

5. Network issue: There might be issues with the network connection, causing data to not be transmitted correctly.