Thanks for letting me know about the website. It’s fixed now.
When I was trying to get it to work last night, I cleared the cache. That did not help. Eventually, I got it to work. I can’t remember exactly what I did. I think that I had to have two custom icons – assign the URL to both – and then delete one of them. But that may not be exact. I just tried a bunch of different ways, and eventually one of them worked.