Tothill Fields Bridewell (also known as Tothill Fields Prison and Westminster Bridewell) was a prison located in the Westminster area of central London between 1618 and 1884. It was named 'Bridewell' after the Bridewell Palace, which during the 16th century had become one of the City of London's most important prisons. Tothill Fields later became the Westminster House of Correction.
The prison that later became the Westminster House of Correction was in operation for over two hundred years.
The Westminster House of Correction was formerly Tothill Fields Bridewell, which was in operation from 1618 to 1884, so over two hundred years. It was probably difficult for the computer due to being a comparison of dates and using the name of the newer building instead of the one we're actually talking about (with only context to say which building is actually being spoken of.)