Bideford marksman Sean Downing took his season's Evo-Stik League Southern Premier Division goal tally to 14 but could not prevent the Robins from losing 3-1 at third-placed Stourbridge.
Downing struck in the 78th minute with a header from Connor Clifford's corner to cancel out Sean Geddes's 68th-minute penalty opener.
Luke Benbow was the home hero, scoring twice in the last six minutes for the promotion-chasing Glassboys. Benbow latched on to a loose ball, after a save by Bideford goalkeeper Tim Sandercombe, to fire the hosts ahead on 84 minutes.
With Bideford pressing for another equaliser, Benbow finished off a counter-attack to make it 3-1 in the 88th minute.
Sean Joyce's Robins will look to bounce back tomorrow night at Arlesey. Bideford remain 15th, two points behind Arlesey but ten points clear of second-bottom Bedworth United with 11 games left.
Tiverton Town remain eighth in Division One South and West after a goalless draw at third--from-bottom Bridgwater Town. Tomorrow night Tivvy visit play-off rivals Yate Town,who are fifth place following a 2-2 draw at Cinderord Town.
The match will bring together the division's top scorers, Tiverton's 18-goal Joe Bushin and Yate's 25-goal Scott Wilson. Bushin's spot-kick at Bridgwater was saved by home goalkeeper Luke Parnell. Bushin also struck the angle with a thumping shot at the start of the second half.
Taunton Town edged further away from the basement with a 2-1 win at relegation rivals Mangotsfield United.
Taunton striker Rod Marsh atoned for his third-minute penalty miss by firing the Peacocks ahead on 31 minutes. Craig Herrod doubled Taunton's lead in the 50th minute before United replied from a 76th-minute Shaun Lamb penalty.
The win lifts Taunton 11 points clear of basement side Bishop's Cleeve – only one team is automatically relegated – ahead of tomorrow's trip to second-placed Poole Town.
Fourth-from-bottom Willand Rovers held Toolstation Western League leaders Bishop Sutton to a 1-1 draw after Danny Jee headed Rovers in front on 16 minutes.
Buckland Athletic beat Gillingham Town 1-0 thanks to top scorer Gavin Hammon's 67th-minute winner while basement side Barnstaple Town were beaten 1-0 by visitors Winterbourne United.
Ilfracombe Town were knocked out of the Les Phillips League Cup witha 2-1 loss at Larkhall Athletic despite taking the lead through Billy Tucker's first-half penalty.