Thanks mate! ?? I did have the exact same problem with the same plugin.
Your question pointed me in the right way and I fixed it.
What you did is working for me,
Go to Roles > Options > Realm
Uncheck 2 things
– Post Type Usage – Events
– Access Types – Viewing content (front-end)
Now its working for me in all browsers and for visitors who don’t have a account.
So thanks! ??