I could be doing something wrong…

Hi!

I just installed the matchHeight WordPress plugin after futzing around with a failed attempt at the script itself. My intention is to have it work with a few blocks in the template itself. But for some reason, it doesn’t seem to be working.
This is the example page I’m working on: https://palmetto-grill.com/wp/

I would like the three blocks below to be of equal height. I set the class for those blocks under settings > Matchheight, but it doesn’t seem to be taking it. Am I doing something wrong?

Thanks!