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Ramsgate lost their unbeaten home record at the top of Isthmian South East.
The league leaders suffered a 2-0 defeat against struggling Merstham in front of a crowd of 1,031 at Southwood.
Both goals came in the first half, to leave Rams winless in three games.
Title rivals Cray Valley missed the chance to move level on points after being held to a goalless draw at home to Chichester.
The Millers remain unbeaten, though, and still have a game in hand on Ben Smith’s side.
Michael Salako scored a hat-trick as Herne Bay beat Broadbridge Heath 3-1 to move back into the play-off places.
Hythe were involved in an extraordinary 4-4 draw at Littlehampton, having led three times.
Johan Caney-Bryan gave the Cannons a second-minute lead but they were 2-1 down after 10.