No.. nothing to worry about. Mine do it too. How is the accuracy would be my concern.
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"Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, a total wreck, screaming Yahoo, with a big smile on your face."
They do that to me to,I have learned that its not a problem as long as they are grouping; if they are not groupin then I look at the base very carefully to see if they are blown out at the lip on one side of the bottom. Lee