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Sittingbourne slumped to their eighth defeat in nine outings in Ryman 1 South on Tuesday, going down 2-0 at home to Corinthian Casuals.
Glenn Boosey gave Casuals a third-minute lead and Jamie Byatt added their second goal on 65 minutes. Sittingbourne then suffered a further blow when Cedric Abraham was dismissed.
Ramsgate lost 1-0 at home to Dulwich Hamlet who thus moved into second place in the table, three points behind leaders Bognor. Peter Adeniyi settled the issue after 61 minutes and the result probably ended any hopes Ramsgate might have had of getting into the play-offs.
It was also a disappointing night for the Rams' Thanet neighbours, Margate, who suffered their fifth successive defeat in the Ryman Premier with a 2-1 loss at Bury Town.