I've been wrestling with what I'm seeing in multiple series charts. It seems like the first series defines the x axis coordinates to be used in plotting all subsequent series.
Trying many chart formats, they all seem to behave the same.
In the chart below you can see only the 1st Series time was used as x axis coordinates.
1st Series(blue) 2nd Series(brown)
12:00:00, 1000 12:00:00, 1000.0
12:00:04, 999.93 12:00:01, 999.65
12:00:08, 1000.44 12:00:02, 999.36
12:00:11, 1000.43 12:00:03, 999.45
12:00:14, 999.97 12:00:08, 998.89
12:00:17, 999.77 12:00:11, 998.89
12:00:20, 999.94 12:00:16, 999.77
12:00:24, 1000.60 12:00:17, 1000.18
12:00:29, 1001.03 12:00:21, 999.43
12:00:31, 1001.12 12:00:22, 999.63
This may be connected to a separate thread where a SfDateTimeRangeNavigator does not seem to align axis with the underlying chart.