Flagged for AI generated code

I just got an assignment flagged for AI generated code. My assignment is very obviously written by a human (me). It is less than 25 lines long. I pasted my other labs into a "99% accurate AI code detector" and literally everything got flagged as well.

Now I have to schedule a meeting with the professor.

Has anyone been through this? I mean I don't know what to say to the professor. I feel like they are expecting me to confess or something but I mean I wrote the code myself. I feel like they are still going to think I'm suspicious or something.

If anyone has gone through this, do the professors acknowledge you have been false flagged? Or do they think you were cheating no matter what you say?