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There is a flat bar that is welded to the stiff wire holders. You don't have to have the wavy wire, they just keep the eggs from moving around. If you have 4 trays you need 2 turners. You slide one out of one and push it in the other. It looks like your bottom 2 trays are either in backwards, or rebuilt where there is no gap for the turner to slide in.
Thank you! Yes, the bottom 2 trays are in backward in the pic. I realized after I posted. Mine does have the wavy wires. Do you think that it is better to use them or leave them out?