Why does this face show a different color when selected?

follow ian hubert barbershop tutorial.blend (783.5 KB)

why does that one square show up a different color when it gets selected?

It is the “active” face. Normaly the last selected. Its a normal behavior.

ok wow you’re right. The weird thing is I selected the face in face select mode, then switched to vertex select mode and hit A, and that face was still highlighted (even though i wasn’t in face select mode) :stuck_out_tongue: Thanks for the answer!!!