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Dover threw away a two-goal lead to lose 3-2 at home to Bishop's Stortford on Saturday.
Chris Kinnear's side looked in control at the break but the visitors came storming back to take all three points and deny Dover the chance to climb into the Skrill South play-off spots.
The result lifted Stortford above the Whites, who now sit ninth, four points outside the top-five, ahead of Tuesday's home game against fifth-placed Sutton.
Dover took the lead on 28 minutes. Liam Bellamy (pictured) held the ball up inside the box and hit a shot on the turn which flew into the corner of the net.
Five minutes later, it was 2-0, Tom Murphy getting himself on the end of a cross and slotting home from close range.
The home side had the ball in the net for a third time before the break but Nathan Elder's strike was ruled out for offside.
A goal from Ashley Miller, 12 minutes after the restart, halved the deficit and set nerves jangling around Crabble.
Stortford then dragged themselves level on 71 minutes when much-travelled striker Cliff Akurang turned the ball past Mitch Walker.
And the comeback was completed by Brian Woodall, who struck to late to inflict Dover's fifth home defeat of the season.