I only use the calorie counters on the machines as a benchmark to compare each cardio session. From what I've read, the counters on all cardio machines are wildly inaccurate and tend to read very high. The ellipticals at my gym say that I burn 800 calories per hour - no way!!
Every manufacturer has an incentive to make its machine appear to burn more calories than the competitors - then you'll use or buy their machine! Even on-line calulators are only guesstimates of how many calories YOU burn.
It sounds like you got a great workout and that's all that matters!