Rylstone was a former electoral district of the Legislative Assembly in the Australian state of New South Wales, created in 1894 from part of Mudgee and named after and including Rylstone. It was abolished in 1904, with the downsizing of the Legislative Assembly after Federation.
Mudgee and Rylstone no longer share an electoral district
The context says that the Rylstone electoral district was abolished, but it does not say what electoral districts Rylstone and Mudgee are in now. It is possible that they still are in the same one. The computer likely didn't realize this and may have been confused because the electoral district was called Rylstone, same as the place.