same content displaying in all events

I’m making a guess, but try going to My Calendar > Settings > Display, check the box “Single Event” in Enabled Views and save settings.

If this is the issue, it’s my fault; I accidentally removed the migration to enable that in 3.8.1, though it was present in 3.8.0.

Well, I’m unable to use your site – it seems like issues with your Litespeed cache, but I’m not able to click on anything at all. There are a ton of JS errors, and they somewhat suggest that the Litespeed JS cache is out of date, although I can’t tell for sure. You may not be seeing this if you’re logged-in.

Can you try clearing the cache? I’m not necessarily expecting this to fix this issue, but I’m hoping it’ll allow me to use your site to try and see what’s going on.

All right – I found it. I’ve seen this once before, and it’s a bit of a strange one.

Your theme includes the following code:

.w-btn::before, .button::before, button[type="submit"]::before {
  content:'';
  position:absolute;
  top:0;
  left:0;
  right:0;
  bottom:0;
  border-radius:inherit;
  border-width:var(--btn-border-width,0px);
  border-style:solid;
  border-color:inherit;
  border-image:inherit;
  transition:inherit
}

What that does is inserts an absolutely positioned empty container in pseudo-content before a wide variety of buttons (including the My Calendar event trigger), and that expands to fill the entire space of the closest parent container with position: relative, in this case, that’s the entire calendar grid.

The consequence is that the *last* button on the calendar has a clickable surface that covers the entire calendar – so anywhere you click, you’re only triggering the last button.

The simplest fix for this is to go to WordPress > Appearance > Customize > Additional CSS, and add this:

.mc-main .event-title { position: relative; }

That makes the heading itself the container, so the button’s pseudo content doesn’t expand to cover the entire calendar.