One thing that I could tell is that - I personally have heard similar experiences like the ones of the OP. ( Both In person and in the news )
For those who remember, I would remind the event in Munich, years ago where people traveling to Germany on a tour got their visas from the Embassy of Spain because their processing time is faster and the denial rate is lower than the German Embassy
Only in Turkish
Obviously these type of cases are seen occasionally so TK has denied the OP to board the flight to OSL.