Engine - Movement Point Bug?

[hades]

When using a new engine design - Upgrading a ship design from the Ion Engine III (1 MV point/engine) to the Contra-Terrene Engine (1 MV point, 1 Bonus MV point/engin) - I only get one total extra movement point (5 MV points to 6 MV points). Shouldn't this go to 10 MV points or is the bonus not cumulative???

Thanks,
Hades

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My arrogance is only surpassed by my brilliance...