That is a really odd situation you have got there with the wall cutting half way through one of your insulation layers. Would you be able to provide an image of your floor composite settings? Is that wall a Complex Profile?
From what I can see in the picture masonry and insulation are the same strength, if not could be that some other element is cutting that part of the wall (for example beam, that has stronger priority material). If you want you could send me the file so i could check it up.
The presence of six nodes and the slightly odd hatch pattern suggest you may have two objects occupying the same space. With the same selection use View Selection in 3D from the context menu and see if that sheds some light on what is happening.