When using a custom CSS for AreaChart/StackedAreaChart, series with small values are not correctly rendered in StackedAreaChart.
See attached image, there is a distinct set of blue boxes acros the chart where the 5th series lies.
Values for this series are in the 5th column of the attached values set.
These values are between 0 and 0.9, as such they should not be visible in a chart where the Y axis ranges from 0 to 1,000.

Values used to create this chart:
# Region 6
   0.0 0.0 0.0 0.0 0.0 1000.0
   0.0 0.0 0.0 14.2 0.0 985.8
   0.0 0.1 0.6 27.5 0.0 971.7
   0.0 0.4 1.7 39.9 0.0 957.9
   0.0 0.8 3.3 51.5 0.0 944.3
   0.1 1.3 5.3 62.5 0.0 930.9
   0.1 1.9 7.5 72.8 0.0 917.6
   0.2 2.6 10.0 82.6 0.0 904.6
   0.3 3.4 12.8 91.9 0.0 891.7
   0.4 4.2 15.6 100.7 0.0 879.0
   0.6 5.1 18.7 109.1 0.0 866.5
   0.8 6.1 21.8 117.1 0.0 854.2
   1.0 7.2 25.1 124.7 0.0 842.0
   1.2 8.2 28.4 132.1 0.0 830.1
   1.5 9.4 31.7 139.2 0.0 818.2
   1.8 10.5 35.1 145.9 0.1 806.6
   2.1 11.8 38.5 152.5 0.1 795.1
   2.5 13.0 41.8 158.8 0.1 783.8
   2.9 14.3 45.2 164.8 0.1 772.7
   3.4 15.6 48.6 170.7 0.1 761.7
   3.9 16.9 51.9 176.4 0.1 750.8
   4.4 18.3 55.2 181.8 0.1 740.2
   5.0 19.7 58.5 187.1 0.1 729.6
   5.6 21.1 61.7 192.3 0.1 719.2
   6.2 22.5 64.9 197.3 0.2 709.0
   6.9 23.9 68.0 202.1 0.2 698.9
   7.7 25.3 71.1 206.8 0.2 689.0
   8.4 26.8 74.1 211.3 0.2 679.2
   9.3 28.2 77.1 215.7 0.2 669.5
  10.1 29.7 80.0 220.0 0.2 660.0
  11.0 31.1 82.9 224.1 0.2 650.6
  12.0 32.6 85.7 228.1 0.3 641.4
  13.0 34.1 88.4 232.1 0.3 632.2
  14.0 35.5 91.1 235.8 0.3 623.2
  15.1 37.0 93.7 239.5 0.3 614.4
  16.2 38.5 96.3 243.1 0.3 605.6
  17.3 39.9 98.8 246.6 0.3 597.0
  18.5 41.4 101.3 249.9 0.4 588.5
  19.8 42.9 103.6 253.2 0.4 580.2
  22.4 45.7 108.3 259.4 0.4 563.8
  23.8 47.2 110.5 262.4 0.4 555.8
  25.2 48.6 112.7 265.3 0.4 547.9
  26.6 50.0 114.8 268.1 0.4 540.1
  28.1 51.4 116.8 270.8 0.5 532.4
  29.7 52.8 118.8 273.4 0.5 524.8
  31.2 54.2 120.8 275.9 0.5 517.3
  32.8 55.6 122.7 278.4 0.5 510.0
  34.5 56.9 124.6 280.7 0.5 502.7
  36.2 58.3 126.4 283.0 0.5 495.6
  37.9 59.6 128.1 285.2 0.6 488.5
  39.7 61.0 129.8 287.4 0.6 481.6
  41.5 62.3 131.5 289.4 0.6 474.7
  43.4 63.6 133.1 291.4 0.6 468.0
  45.2 64.8 134.6 293.4 0.6 461.3
  47.2 66.1 136.1 295.2 0.6 454.8
  49.1 67.3 137.6 297.0 0.6 448.3
  51.1 68.6 139.0 298.7 0.6 441.9
  53.1 69.8 140.4 300.4 0.7 435.6
  55.2 71.0 141.8 301.9 0.7 429.5
  57.3 72.2 143.1 303.5 0.7 423.3
  59.4 73.3 144.3 304.9 0.7 417.3
  61.6 74.5 145.5 306.3 0.7 411.4
  63.8 75.6 146.7 307.6 0.7 405.5
  66.0 76.7 147.8 308.9 0.7 399.8
  68.3 77.8 148.9 310.1 0.7 394.1
  70.6 78.9 150.0 311.3 0.8 388.5
  72.9 80.0 151.0 312.4 0.8 383.0
  75.2 81.0 152.0 313.5 0.8 377.5
  77.6 82.0 153.0 314.5 0.8 372.2
  80.0 83.0 153.9 315.4 0.8 366.9
  82.5 84.0 154.8 316.3 0.8 361.6
  84.9 85.0 155.6 317.1 0.8 356.5
  87.4 86.0 156.4 317.9 0.8 351.4
  89.9 86.9 157.2 318.7 0.8 346.4
  92.5 87.8 157.9 319.4 0.8 341.5
  95.1 88.7 158.7 320.0 0.9 336.7
  97.7 89.6 159.3 320.6 0.9 331.9
 100.3 90.5 160.0 321.2 0.9 327.2
 102.9 91.3 160.6 321.7 0.9 322.5
 105.6 92.1 161.2 322.2 0.9 317.9
 108.3 92.9 161.8 322.6 0.9 313.4

Custom CSS used for decorating the series:
.mfcl-chart .default-color0.chart-series-area-line { -fx-stroke: transparent; }
.mfcl-chart .default-color1.chart-series-area-line { -fx-stroke: transparent; }
.mfcl-chart .default-color2.chart-series-area-line { -fx-stroke: transparent; }
.mfcl-chart .default-color3.chart-series-area-line { -fx-stroke: transparent; }
.mfcl-chart .default-color4.chart-series-area-line { -fx-stroke: transparent; }
.mfcl-chart .default-color5.chart-series-area-line { -fx-stroke: transparent; }
.mfcl-chart .default-color6.chart-series-area-line { -fx-stroke: transparent; }
.mfcl-chart .default-color7.chart-series-area-line { -fx-stroke: transparent; }
.mfcl-chart .default-color8.chart-series-area-line { -fx-stroke: transparent; }
.mfcl-chart .default-color0.chart-series-area-fill { -fx-fill: gold; }
.mfcl-chart .default-color1.chart-series-area-fill { -fx-fill: green; }
.mfcl-chart .default-color2.chart-series-area-fill { -fx-fill: deepskyblue; }
.mfcl-chart .default-color3.chart-series-area-fill { -fx-fill: crimson; }
.mfcl-chart .default-color4.chart-series-area-fill { -fx-fill: blue; }
.mfcl-chart .default-color5.chart-series-area-fill { -fx-fill: darkmagenta; }
.mfcl-chart .default-color6.chart-series-area-fill { -fx-fill: black; }
.mfcl-chart .default-color7.chart-series-area-fill { -fx-fill: pink; }
.mfcl-chart .default-color8.chart-series-area-fill { -fx-fill: orange; }
.mfcl-chart .default-color0.chart-area-symbol { -fx-background-color: gold; }
.mfcl-chart .default-color1.chart-area-symbol { -fx-background-color: green; }
.mfcl-chart .default-color2.chart-area-symbol { -fx-background-color: deepskyblue; }
.mfcl-chart .default-color3.chart-area-symbol { -fx-background-color: crimson; }
.mfcl-chart .default-color4.chart-area-symbol { -fx-background-color: blue; }
.mfcl-chart .default-color5.chart-area-symbol { -fx-background-color: darkmagenta; }
.mfcl-chart .default-color6.chart-area-symbol { -fx-background-color: black; }
.mfcl-chart .default-color7.chart-area-symbol { -fx-background-color: pink; }
.mfcl-chart .default-color8.chart-area-symbol { -fx-background-color: orange; }
.mfcl-chart .chart-area-symbol{-fx-background-radius: 0;}