Instead building roof i build floor?

So, im building roof for an half hours and i just realize instead building roof im building floor did i do something wrong?

Roof files show up as floor tiles iirc

Not quite certain, but if I recall correctly floor tiles are like a visual representation of the roof above. So when you place a roof, you see the floor below it.

Really??but why my room still bright when i close the door?

Do you have curtains on your windows, or a night vision bionic/ light active?

Im so dumb looll…my cranial flashlight still active when i close the door xD…Thank you for all of the answer

No prob. Glad to help.