They went down 1-0 to Gainsborough Trinity, who continue to climb the table under Curtis Woodhouse are now nine matches unbeaten.
Alex Wiles scored the only goal of the game on 78 minutes.
It meant that South Shields maintained top spot, despite being held to a 2-2 draw at Stalybridge Celtic.
They led twice through Wouter Verstraaten and Robert Briggs’ penalty, but were pegged back both times by Darius Osei.
Lancaster City consolidated their play-off place with a win over Warrington Town.
Charlie Bailey’s brace shortly before half-time cancelled out Jack Mackreth’s lobbed opener, as the Yellows slipped out of the top five.
Taking their place are Nantwich Town, who won late at home to Bamber Bridge.
David Webb struck in the 89th minute to deny Brig, who had fought back from 2-0 down to level things up.
Another Webb on the scoresheet twice was Patrick at Mickleover Sports, who led three times at FC United but had to settle for a point in a 3-3 draw.
Southport loanee Morgan Homson-Smith scored on his debut for the Reds, and league top scorer Tunde Owolabi was also on the scoresheet.
Buxton left it late to win 3-1 at Grantham Town.
Curtis Morrison gave the Gingerbreads a first half lead, before Diego De Girolamo’s penalty levelled things up 13 minutes from time.
De Girolamo then scored in the 89th minute and Rumenio Barai made sure in injury time.
Stafford Rangers made it three games unbeaten with a 2-2 draw at Witton Albion.
Billy Smart twice had Witton in front, but bottom side Stafford fought back through Berti Diau and Jonathon Moran.
Scarborough Athletic are six points off a play-off spot after beating Ashton United 3-1.
Josh Wilson and Michael Coulson exchanged first half penalties, before the game turned on Liam Tomsett’s sending off early in the second half.
Coulson’s second on 65 minutes gave the Seadogs the advantage, and Ryan Watson made the points safe late on.
An emotional day at Matlock Town saw the Gladiators earn a point in their first game since the tragic death of midfielder Jordan Sinnott.
Pitou Crouz cancelled out Tom Pratt’s early opener for Hyde United.
Elsewhere, Whitby Town beat Atherton Collieries 3-1, and Morpeth Town defeated Radcliffe by the same scoreline.
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