Zorg Empire

When I click on "Overview," I see "Non-Active," below my planet. Is this normal? What or why is it considered "non-active?"

because your not building anything ^^

But I am. I have buildings, a fleet and just started colonizing another planet. I must be missing something here.

It means you are currently not building or upgrading a "building" in that planet.
When you are upgrading something, the (building name + lvl) will replace the non-active note.

an example would be

You have a Metal Mine lvl 3 and you upgrade it

Then where it had non active it will now say Metal Mine 4 ---:---:---