Keyboard changes 50 to 5-0

I don’t know when it happened, but recently when I enter “50” it is autocorrected to “5-0”. I checked the text replacement in the Keyboard preferences, and there’s nothing there. This also happens on my MacBook Pro and iPhone 13 Pro Max. I’ve checked the text replacements on both of those, and I find nothing.

There is no way I would have created this, as I type 50 a lot.

Any suggestions on why it’s doing it, and where I might be able to fix this.