question on modalshape plot

[sarapoT]

hi!
I ran several modal analysis and put the "vtu" files into Paraview to check the modalshapes., Including goland_wing model、simple_HALE model and my own hale wing model. I found that there`s only half of the wing can be plotted, another half is shown as undeformed status:

Its goland_wing 13rd modalshape in the picture,I want to ask why would it be like that,and how can I fix it?