Blending mocap animation problem

Hi I have problem when blending mocap animation.

Frame 291
http://img838.imageshack.us/img838/6565/frame291.th.png

Frame 328
http://img695.imageshack.us/img695/7075/frame328.th.png

Frame 341
http://img190.imageshack.us/img190/5913/frame341.th.png

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Sorry my english is no good I use google translate.