Mifare classic emulation

Hello world !
I have just received my flipper zero and I would love to get some explanations.

I’ve read the mifare classic witch is opening my door. All sectors are the same, I’ve verified by emulating the card on the F0 and reading it with the Mifare classic tool app on android.

I don’t understand why the emulation did work for MFC app but not for the actual reader opening my door.

Could someone explain please ?