This Is England '86 is a 2010 British drama miniseries written by Shane Meadows and Jack Thorne, a spin-off from the 2006 film "This Is England". Set three years later, it focuses on the mod revival scene rather than the skinhead subculture, with the gang variously adopting an eclectic mix of clothing styles.
This Is England '86 was released four years after the film This is England
It is correct because the film was released in 2006 and This Is England '86  was released in 2010. This is a 4 year difference. I'm not sure why the system confused this