Strange!
Just noticed that 20180306.gif in my webfiles folder got updated with the same data in it as in the attachment from post above which was day 5, not day 6.
There wasn’t any data in 20180306.gif before.(No lines in the graphs)
The file 20180506.gif was created 04:23 when I selected day 5 in View/Graph history.
The jpg for the attachment I created at 04:29
#-o