Hi,
The default x-axis labels on the yearly plots are in month/day of month format. So the vertical line above a given month/day label represents a day of the year in time. So what you are seeing (reading from right to left (ie most recent to oldest)) is 1 March (2020), 1 January (2020), 1 November (2019) through to 1 March (2019). Seems normal to me. (though I must confess I the month/day format is all wrong to me :) )
Sorry but I don't understand, what do the two number represent? 03/19, 05/19, 07/19 seem to be March, May and July 2019 but then 09/09 and 11/09 - are these typos? Perhaps 2019? 01/00 and 03/00 - again more typos? are these meant to be 2020? If you want the plot to show month/year instead of day/month (or month/day) then you will need to change the x_label_format option for the yearly plots. You will find this in the Standard skin.conf under [ImageGenerator] [[year_images]]. Be aware though that you will then have, for example, 11/19 (November 2019) centred under the vertical line that is actually 1 November 2019 so your plot will be somewhat misleading time wise.
Gary