I can advise to rule out a plugin conflict with the Health check plugin. First you install the WordPress Health Check plugin. Then, you can rule out a plugin or theme conflict is by installing the Health Check plugin, then go to WP → Dashboard → Heath Check → Troubleshooting. There you’ll Enable Troubleshooting Mode, then once that’s activated you’ll reactivate Event Espresso only via the Health Check’s Troubleshooting item in the WP admin bar. At that point, can you check to see if the issue persists?