The Gravity Forms plugin js script is being blocked by the BPS Pro Plugin Firewall. Do you have Plugin Firewall AutoPilot Mode turned On? Plugin Firewall AutoPilot Mode automatically creates whitelist rules so that you do not have to manually create Plugin Firewall whitelist rules.
Do these steps and let me know if the Gravity Forms js script is automatically added to the Plugin Firewall whitelist rules text box.
1. Click the Plugin Firewall menu link.
2. Click the Plugin Firewall > Test Mode button.
3. Go to your Gravity Forms contact form page.
4. Wait 1 minute and then go back to the BPS Pro > Security Modes > Plugin Firewall section and check the Plugin Firewall whitelist text area to see if the Gravity Forms js script has been added to the Plugin Firewall whitelist rules.