Exeter City lost their 1-0 lead to a late goal at St James' Park on Saturday, when Manny Omoyimni curled in a 90th minute free kick.
City had worked hard and Sean Devine put them a goal ahead in the 32nd minute, but for their dominance, they were unable to find a second, and when Chris Todd handled outside their box following Margate's best 15-minute spell, the former Oxford striker put away their final chance.
City now travel to Dagenham and Redbridge next Saturday.
Torquay scored three goals for the second consecutive game and finally put to bed their eight-hour goal drought when they beat Lincoln 3-1 on Saturday.
Leroy Rosenior gambled with David Graham as a non-starter, after his non-appearance last week through a one-match suspension, and fellow striker Jo Kuffour took his chance with style.
It was his knock back from a Kevin Hill cross that Jason Fowler volleyed home on 10 minutes. But Lincoln scored an out-of-the-blue equaliser before a Kuffour cross found Kevin Hill in the 56th for his first goal of the season.
Kuffour then got his reward for his hard work with an 89th minute strike following a wonderful Graham back heel that left Lincoln's defence static, and which Kuffour read perfectly.
Argyle got back to winning ways on Saturday by putting three past Rushden and Diamonds at Home Park.
And Ian Stonebridge marked his return to the starting line-up with a fine display and a 57th minute second goal.
The Pilgrims had to wait until the second half before opening their account. Graham Coughlan headed the first on 46 minutes, and in the final minute of the game a trademark Paul Wotton free-kick, from a least 35 yards, closed the show in dramatic style.
But it could have been four; a first-half penalty was missed by Hasney Aljofree.
The Pilgrims travel to Stockport next weekend.
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