Great question. Because trantric yoga does refer to shiva as the passive and shakti as the active. The shakti is is the energy, the power. It is energy in which is active. Shakti is the driving force behind shiva’s actions and power. It is like the feminine is the behind the scenes while the masculine is the manifest.
So it’s a matter of perspective. Both can be seen as either passive or active which they both are depending from where and how perceive it. It’s like the yin and the yang, they are both one in the same.
I tend to see shiva as the active because it represents consciousness. But others may see it the other way and they aren’t wrong either.