FX sub and inhibitive interaction bug?

I had some strange behavior between an fx sub and an inhibitive sub. fx sub with a dynamic intensity fx running with the sub at 60% Inhibitive sub controlling same channels at 80% when I started and stopped the fx using the bump button the base level under the dynamic changed. This only happened when the inhibitive was below 100% I think this is a bug. :P This is all intensity only channels.
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