Sometimes they just get hungup on the pointer or the fulcrum. I usually make sure mine swings free before trying to zero it.
I think once you get pluggin with the 550 you will see that the powder measure stays pretty damn consistent and you wont be using the scale much at all except at the beginning of your reloading session to make sure nothing changed from last time or when you change a setting. But as long as you are sticking with what ever setting you had last time(and you confirm it prior to start) I have not found that I felt the need to measure every 10th round. Now with that said, since you are new to it, I would be(I did) measure every 10th round for at least 500-750 rounds to make sure you are comfortable with your powder measure throwing a consistent, accurate load.
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