I've been having that same issue. I didn't even realize I was trying to make a four-layer corset, I considered the fashion layer and the strength layer to be a single layer but my other strength layer and lining as two separate layers. Mine looks exactly like your picture, and I have been struggling with getting the seams to line up as well. I'm new to corset making and still learning and since I am starting with canvas instead of coutil I was concerned a single strength layer would not be enough. Think I'll be starting over tonight with the one strength layer and see how mine goes. Good luck, though!