Problem displaying surface while using parallel tool path

[Anonymous]

Hello all. I am a new user to Fusion 360 but have used Artcam for many years. I have recently made the switch to full solid models and using Fusion for generation of the toolpaths. I have had nothing but good results with the Cam side of Fusion until yesterday. While using parallel toolpaths I many times  change the raster degree and regenerate the path until I get the path that I want. Yesterday I was doing this and Fusion started displaying the surface to machine ( or not to machine) in the wrong place and would generate a toolpath sometimes up to 10 inches above or below my workplane. I will include pics.  The part in the pic is a solid the uses a blank of 27 inches by 10 inches and 2 inch thick. I am cutting foam so I can repair the damage but I havent been able to find a fix.