Logical gesses would be most likely that you are not doing all the Custom Code steps correctly or maybe the php handlers are not correct for BlueHost. If that is not the case then first check that the handlers are correct and then double check you Custom Code steps.
Root htaccess File Custom Code Setup Steps
1. Enter your custom code in the appropriate Root Custom Code text box.
2. Click the Save Root Custom Code button to save your Root custom code.
3. Go to the BPS Security Modes page and click the Root Folder BulletProof Mode Activate button.