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Yes, that's a known open bug of the new animation system. The bbox handling was simply left out for now (the bbox you can see is that of the initial pose).
Ok, I fixed some parts of bbox handling for skinned meshes (in the 1.4 branch of SVN). However, you should note that bbox is still not working for all animated meshes, and that joints outside of the optimal bbox do extend the bbox to include also those points.
lantis I'm using Irrlicht 1.4.4 with 3dsMax & Panda exporter, then sometime I need Mview, so I got the same problem. And I only find 1 way recalcultate bounding box for all buffers.