Reading the output, are you using any Custom Fields on your client page? If so, do yoru custom field names contain any special characters? Your log files are displaying a checkbox element in the output above.
Can you re-post your log files, enclosed within a “code” tag (select the code, then click on the the </> butto in the toolbar.) This should hopefully clarify the log file.
Enabling “debug logging” in the ipconfig.php file will also yield more detailed information to help resolve the problem.