Turn off the clean URL structure of landing pages. Add this to your functions.php file.

## turn-off-landing-page-parameter-cleaner.php
<?php
/* Turn off the clean URL structure of landing pages. Add this to your functions.php file. */
define('Inbound_Now_Disable_URL_CLEAN', true);
	<?php
	/* Turn off the clean URL structure of landing pages. Add this to your functions.php file. */
	define('Inbound_Now_Disable_URL_CLEAN', true);