Please see attached fiddle.
Here, At x-axis data contains 3 times 0 value and it displays 3 times. In real scenario it will display single point on x- axis and different value on y-axis.
please refer attached sample screenshot.
FacetChart is not a scatter chart and does not support such mode. You can achieve a similar look with NetChart though:
We are looking forward to add axis there so you can use it as a scatter chart if necessary.
As attached above screenshot from my side same look and feel possible through net chart than please give me solution for net chart with axis.