Because some rando or another hacked my site a few months back. I was barely able to recover it using a method that mostly worked, but which replaced certain types of characters with “?”.
There are oodles of them across many pages, unfortunately, which I occasionally get time to correct when I have nothing better to do. But mostly I ride horses, so … it could take some time. In the interim, just pretend your reading Newcastle and have to mentally replace t’s with s’s here and there (except in my case, you will be mentally replacing “?” with nothing, which is annoying, but probably easier).