Multiple calendars displaying?

Hi!
I installed the plugin on one Divi and it worked perfectly. I installed it on a second Divi site, one in development, and it’s displaying all 12 calendars at once with an unexpected border. I thought it might be a weird interaction between something on the page and the plugin but I put it on a blank page and it did the same thing.

I have triple-checked that I’m using the same settings as I did on the first site.

Help?

(I’d rather not share a link as it is in development still.)

what it’s doing

my settings