Help! Unable to create event in Events

[Kate]

It's telling me that I'm using < and > when I haven't. They are in the source code created when I inserted an image url, as I've been doing for years, and now it's a problem. I cloned The Holiday Gala which we are changing to Holiday Bingo. I saved the clone without making any changes, and it saved. I was even able to get the new image to save. But when I tried to add a level, I suddenly cannot save because of < and >. Screenshot attached. Org ID 00DG0000000kzF3 Access Granted.

[Kate]

Never Mind. I think I figured it out.