Un needed popup appears

So, I am using MEC on my website, and I want the event details to be displayed in a pop-up rather than a page for itself, but I faced two issues:
1-: When I click on the events to display its details, it works fine, but when I click on the speaker, it shows the popup for the speaker behind the original popup. I fixed this issue by entering in the custom CSS the following code:
.lity {z-index : 9999999999;}.
2: There’s a third popup screen that appears with just one close button, no data, nothing. How do you make it not show in the first place?