MFP/elliptical machine dif in calories burned??

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Is it normal for the MFP website and the elliptical machine to show a completely different amount of calories burned? The machines yesterday said 330 calories in 30 min. But the website says 634. When logging my exercise, which should I enter?

If it makes a difference, I DID enter my weight/age on the elliptical machine so I would THINK it would figure it correctly.

Also, when I enter my calories burned for the day, my calorie goal increases that amount.... again, normal?

Thanks!

..... I just realized I posted this in the wrong topic. Sorry!