Yes, I've heard this too. Apparently in the early days of JAR, the exams suffered from poor translation into English and the wrong answers were deemed correct. Even now, they're not perfect and remarking of an entire set of papers happens from time to time. I remember during my brush-up weeks the instructors saying things along the lines of "The correct answer is A but the CAA wants B" At 52 quid a time, they must be making a fortune.
If these were GCSEs there would be a public outcry!