I'm still pretty early in my first career game (been playing KSP for around 9 months, mostly in a science game, never done a career before).
I just sent Jeb up for three orbits (a little challenge there, going to orbit with fewer than 30 parts), and after he landed, I accepted a contract to test a "Swivel" engine in flight above Kerbin -- 61-65 km altitude, 410-590 m/s, if I recall correctly. Okay, built a rocket (Thumper booster w/ fins, decoupler, "Swivel" engine, 400 tank, decoupler, Mk. 1 pod, Mk. 16 parachute) -- pretty basic stuff.
Launched Val almost vertical, staged away the booster at burnout, waited.
Apoapsis was going to be a little short, so I kicked a little with the Swivel. Made altitude going too fast, so turned tail first and burned to slow down, passed through the velocity range while well within the altitude range, had both parameters ticked green in the contract display before I shut down the engine and staged.
Got back to splashdown, contract unfulfilled.
What'd I miss?