When I was exiting the Schengen area last year, the immigration officer left his booth for 10 to 15 minutes without telling me the reason why. When he returned, he just stamped my passport without asking any questions or clarifications from me. There were also no additional marks or notes in my passport aside from the stamp.
Until now, I'm still confused about what's happened since my entry to the Schengen area 2 weeks preceding my exit had been hassle-free. I'm sure that I didn't commit any crimes or visa violations during my stay there. Can anyone share their insights as to what happened?