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There could be several reasons for a 400 error when files are being uploaded through AJAX, including:

1. Invalid request: The request being sent to the server may be invalid, which can cause the 400 error. This could be due to missing or incorrect parameters in the request.

2. Size limit: There may be a size limit for the files that can be uploaded through AJAX. If the files being uploaded are larger than the limit, it can cause a 400 error.

3. Server error: There may be an issue with the server that is causing the 400 error. This could be due to server overload, server-side code issues, or other server-related issues.

4. CORS: Cross-origin resource sharing (CORS) may be blocking the request. This can happen if the server is not configured to allow requests from the client.

5. Authentication: The server may require authentication to perform the requested action. If the user making the request is not authenticated, it can cause a 400 error.