undesired bending effect when twistintg on sw2005 flex command

Hi everyone, i'm trying to twist 270 degrees a box which is 22*22*140 mm using the flex feature. the resultant object has an undesired bending in the midle while the top and bottom stays in position along twist axis. doing the same action on Rhino gives me a fine twist, but i need the object as sw2005 feature for future editing. does anyone of you guys encounter this strangeness? and if so, is there a way to fix it in solidworks?

Thanks, Gil Alsberg

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Gil Alsberg
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