Dirkie Chamberlain (born 3 November 1986, Pretoria) is a South African field hockey player. At the 2012 Summer Olympics she competed with the South Africa women's national field hockey team in the women's tournament. She has also competed at the 2010 and 2014 Commonwealth Games.
Dirkie Chamberlain was born before the 2012 Summer Olympics.
It's definitely correct because she was born in 1986, which is before 2012. I think the system got it wrong because it saw "born" and "1986" and judged that 1986 was not the same as 2012, so it didn't really understand the question exactly.