There is a default behaviour for Flex LineChart to set gridline for zero value above the x-Axis (when any of the datapoints are 0 or 1) so that the two of them are distictly visible. Depending upon your case, you might want to show zero values on-top-of x-Aixs rather then at a distance.
The problem arises due to Flex automatically adjusting minimum property of LinearAxis when it finds datapoints close to zero. You may fix this problem by setting minimum to 0 (zero). Alternatively you could try using the padding property to 0 (zero) as well.
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