Problem with chart data wrapping at the end of a visible timeline and overwriting valid data

[iand-65]

We are using chartfx version 11.2.7

We have a x-axis timeline moving from right to left with the right side being the most recent. Every few seconds we add a new DoubleGridDataSet to the ContourDataSetRenderer at index 0. This new data is displayed as expected with previous data moving periodically towards the y axis which is positioned on the left. We are adding new datasets because they have potentially different number of y axis values.

Once the data reaches the Y axis the data values are then displayed as a solid block periodically moving from the Y axis from left to right - overwriting data that is still moving from right to left.

So below the valid data sets are the thin green bars and the thick block is data moving from the Y axis to the right - overwriting the valid data.

We would have expected the oldest data to disappear beyond the Y axis and be visible via zoomer panning not come back from the Y axis as appears to be happening. Limiting the datasets by deleting the oldest above a certain amount stops the block from advancing to the right so it appears it is related to having too many datasets on the visible chart.

Converting the chart to a line based chart (with e.g. timeline being the same) behaves as expected.

Any help appreciated.