Configuration grayed out with wrong model

Hello Everyone

Please look at the attached picture. This part supposed to be 45 mm long. When I measured it, came out 70 mm long. Now, look at the configuration window. Even though there is only one configuration, it is greyed out. So, I double clicked on configuration name. Part model changed to 45 mm. What is with this behavior?

I am on SW 2010 SP4.0. Thanks in advance,

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