Ram Semi rigid Diaphragm deflection

Hi Ram, 
I  have a question for semi-rigid diaphragm deflection.
Along a frame line, using a Semi-rigid diaphragm, and drag beam members modeled as frame elements, we read the deflection along the frame line at either end of a building (delta 1 and delta 2 in the sketch below). We expect the deflection to be the same. However, we are finding that the deflections are different. Why does this occur?
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