How do I unlock level 66 from level 75 on Farm Heroes Saga?

I apparently didnt unlock Polar bear in level 66 but didn't realize until I got to level 75.  I have gone back and won at least 6 games of level 66 but it's still not unlocked.  I have tried it a couple of different ways by actually playing the game from level 66 -- and then by going to level 75 and clicking on the grayed out polar bear which takes me to level 66.