Page Navigation problem

I’m having a problem that started when I upgraded from 2.7.1 to 2.8. There’s an extra character in the “previous page” page navigation links on every page that’s not the main page.

So where it used to be ? Previous it’s now — ? Previous and I’m not sure where the — is coming from.

I’m using theme Black n White 1.0.2

Any help would be appreciated.