Strings that occur twice in a name of an article are highlighted twice.
Steps to reproduce:
Go to the English wikipedia, and type
A: *A*frican *A*merican (U.S. Census) is highlighted
B: *BB*C is highlighted
J J: *J*. *J*onah *J*ameson
Or go to the German wikipedia type
Br: *Br*itish *Br*oadcasting Corporation is highlighted
Expected behavior: Only the first occurrence of the letters typed in should get highlighted.