Reminders is making constant crazy errors
I'm using a 2018 Intel Mac Mini with Sequoia 15.7.1.
I try to set up a monthly reminder, and no matter what day I say, it makes the reminder for the 5th day of the month.
Or, I ask it to remind me, and it shows me a web search, or says something about Apple Pay that I don't even have, or brings up a clock thing like it's setting an alarm, or makes reference to some other thing I don't have and says it can't do it or use it.
And of course, there's all the recurring reminders that stop after a few rounds, or never even work once.
I have exactly one device, the desktop as described above. And therefore, there is no synching going on.
I do not use iCloud. I checked the one associated with my account; interestingly, ONE reminder from a year and a half ago somehow got in there, but other than that, it's completely empty.
This isn't a complicated application, so something really weird must be going on for it to be making so many errors. Does anyone have any idea what's causing this, and more importantly, any idea how to fix it? Thank you!
Mac mini, macOS 15.7