I suspect the issue will be related to how highcharts is interpreting timestamps in the plot data rather then the wrong data being in the plot data files. I have seen something like this before but it was related to the timezone of the client computer viewing the plots, would seem that is not the issue here though. I am rather pushed for time at the moment but will have a look when I can, though it's been a while though since I have delved into highcharts.
Phil, can you post one of the generated highcharts data files that is displaying the issue. Would help to know your timezone and at what time the file was generated as well. Gary -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to weewx-user+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.