Why would only one or two of them at random exhibit this behavior?
Let us know if there is any red in xray view. if there is or isn't then we will try to think of another theory. Also could you move to a layer that shows these extra membranes you are talking about? I don't see what you mean in the photo. Also please zoom in (plus key on number pad or I think mouse wheel also works).
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ahoeben 1,981
Check the model in X-ray view, it is probably not watertight/manifold.
You can try searching for the "Union overlapping volumes" setting in the sidebar (use that Search... box), and turning it off.
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