The curved wave piles up into a peak at the focus of the turn, but you get two curved waves and therefore two peaks. You can think of that curved wave as lots of little waves launched towards the focus of the turn as you go around the jink. All those can meet since they come from different directions. But surface waves travel at the same speed, so the second wave that your hull puts off can never meet with the first one since it's chasing it at the same speed. It too piles up at its focus, but the two foci stay separate. I've never really looked, but I guess one of those waves comes off the bow and one off the stern.
Think about a boat going in a straight line. Waves come off at angles (19.5 degrees to be precise - it's called a Kelvin wake) and you get 3 or 4 ridges at that same angle. But they never meet - they just propagate away from the boat at the same speed as each other - chasing, but never catching up and becoming one wave.