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Luke Baptiste scored a last-minute penalty as Dover regained top spot in the Isthmian Premier.
Whites trailed to an early Tommy-Lee Higgs strike at bottom side Bognor Regis.
But Ruben Soares-Junior levelled 10 minutes before the break and Baptiste held his nerve to earn a 2-1 victory for the visitors.
Jake Leberl’s side move above Billericay, who were thumped 4-0 by in-form Dartford, a win that sent Ady Pennock’s side up to third.
Cray Valley trail Dover on goal difference in second place.
They beat Canvey Island 2-0 courtesy of Kenny Aileri’s first-half effort and a clincher from Tom Beere after the break.
Folkestone boosted their play-off hopes with an impressive 3-0 home win over fifth-placed Horsham.
Ade Yusuff’s third-minute penalty sent Invicta on their way and Jack Jebb doubled the lead before the half-hour mark.
Daniel Smith added an injury-time third as Andy Drury’s men moved up to eighth.
Chatham’s home game against Hastings was abandoned due to a medical emergency in the crowd.
Josh Ajayi’s injury-time goal kept Ramsgate top of Isthmian South East.
Ajayi struck in the third minute of added time to give Rams a 1-0 victory at Erith Town - a sixth successive win for Ben Smith’s league leaders.
They remain two points clear of Sittingbourne, who were 4-0 winners at AFC Croydon.
Ryan Kingsford opened the scoring inside five minutes and Troy Howard soon made it two before Richie Hamill stretched the lead on the half-hour mark.
Kingsford added his second as the Brickies warmed up for next weekend’s FA Trophy last-16 tie at Southend with another big win.
Third-placed Margate were twice pegged back in a 2-2 draw at home to struggling Phoenix Sports.
Ben Allen’s opener was cancelled out by Tyler Anderson but Max Walsh restored Gate’s lead before the break.
Dominic Morgan-Griffiths’ second-half goal salvaged an important point for the visitors in their survival bid.
Ashford slipped to defeat in co-owner Lloyd Hume’s first game as manager.
Hume, who replaced Danny Kedwell as boss on Monday, saw his side beaten 1-0 at home to Merstham.
Harry Pointing scored the only goal midway through the second half.
Sheppey missed the chance to climb back into the play-off places after conceding a late equaliser at Eastbourne Town.
The Ites led through Jordy Ndozid but a James Ding penalty levelled matters before half-time.
Lekan Majoyegbe put Ernie Batten’s side back in front on 77 minutes but Alfie Simmons made it 2-2 with eight minutes left, leaving Sheppey outside the top five on goal difference.
Deal Town ended a run of three defeats by beating a Sevenoaks side who were looking for a fifth straight win.
The Hoops turned the form book upside down with a 3-1 victory, moving back above Oaks into eighth place in the process.
Macca Murray’s penalty was cancelled out by Rodney Eruotor but second-half goals from Ashley Miller and Alife Foster won it for the hosts.
Herne Bay’s game at Beckenham and Hythe’s relegation scrap at Littlehampton were postponed.