Tipload result chart Y axis is wrong

There is a known issue in the results chart generated by the Tipload module (Detailed Results>Tipload Charts).

If the tipload direction, as wind angle increments, swings from West of North to East of North, or visa versa, the data in the chart is not displayed correctly, see the orange line in the chart below. However it is obvious what the directions are doing.

Known issue up to at least version 7.14.