After baking, bread coated with shiny residue
It looks indeed like the Sourdough and the anti-stick disagree with each other... though the extent of it is something I have neither seen nor heard about yet! May be the non-stick version you do have. If the dough was left in the pan to rise for a while, that may have been part of it.
But I have to say, except for the issue with your pan, the bread looks amazing!!!