I'm not so sure that is weird (or at least MORE weird than Collision deformer usually is !) but at the same time there is something odd going on with some of those modes, and it'll take me a little while to figure out what it is meant to be able to do vs what it actually is doing...
We should note that your sphere is currently wholly inside a closed volume. And I notice there IS no mode in that collision deformer to match that state ! We can deform outside a volume but possibly not from inside one it would seem ! But we should be able to test that theory by simply deleting one face of the cube after which I would expect the Collision mode 'inside' to work.. however it doesn't, so something seems wrong. Inverting Normals on the cube doesn't help either as far as I can tell. nor does disabling Render Perfect in the Sphere (previously known to cause certain issues with things like this) or making the sphere editable. And already we are running out of things to check...
Also I am finding no difference between modes inside and inside stretch - the sphere is stretched regardless of the 'Inside' setting.
Anyway, investigations continue, and I will report back when I have additional answers / info.
CBR
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