The result was made worse after Rochdale pulled off a shock win over Stevenage and Hartlepool and Harrogate both picked up draws.
Crawley still have three games in hand on Hartlepool and trail by three points.
They travel to Sutton United on Tuesday for one of their games in hand.
Here’s how those results have influenced the supercomputer’s prediction on how League Two will finish.
Give us your predictions on how the season will finish via our social media channels.
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Crawley Town are now three points from safety. Photo: Getty
. Leyton Orient - 89pts (+27)
Win the league: 72% Promotion chances: 96% Play-off chances: 5% Photo: Pete Norton:
. Stevenage - 80pts (+19)
Win the league: 8% Promotion chances: 51% Play-off chances: 43% Photo: Pete Norton
. Carlisle United - 78pts (+23)
Win the league: 6% Promotion chances: 47% Play-off chances: 48% Photo: Stu Forster
. Northampton Town - 78pts (+19)
Win the league: 4% Promotion chances: 43% Play-off chances: 50% Photo: Pete Norton
. Bradford City - 78pts (+18)
Win the league: 6% Promotion chances: 48% Play-off chances: 48% Photo: Chris Holloway
. Mansfield Town - 76pts (+16)
Win the league: 3% Promotion chances 36% Play-off chances: 48% Photo: Chris Holloway
. Stockport County - 74pts (+21)
Win the league: 1% Promotion chances: 29% Play-off chances: 49% Photo: Naomi Baker
. Salford City - 74pts (+19)
Promotion chances: 28% Play-off chances: 50% Photo: Pete Norton
1. Leyton Orient - 89pts (+27)
Win the league: 72% Promotion chances: 96% Play-off chances: 5% Photo: Pete Norton:
2. Stevenage - 80pts (+19)
Win the league: 8% Promotion chances: 51% Play-off chances: 43% Photo: Pete Norton
3. Carlisle United - 78pts (+23)
Win the league: 6% Promotion chances: 47% Play-off chances: 48% Photo: Stu Forster
4. Northampton Town - 78pts (+19)
Win the league: 4% Promotion chances: 43% Play-off chances: 50% Photo: Pete Norton