Overlapping of graph date intervals (cases.html)

[coding-practitioner]

The cases.html page depicts a line plot of average covid cases for a 2 week period correctly from the date period "2023-01-02 to 2023-01-15" onwards.

However, in the date periods preceding "2023-01-02 to 2023-01-15", there seems to be an overlap in dates.

For example, after the date period "2022-12-19 to 2023-01-01", the next time period is "2022-12-26 to 2023-01-08" instead of "2023-01-02 to 2023-01-15".

For your reference, in the image above, all the points encircled in purple are the overlapping dates.