Daily corona virus cases of countries, by region
Note that the charts are generated by a data table with a fixed number of countries for each region. However, most regions do not have the fixed (maximum) number, so the "extra non-existent countries" show up as "0" with a flat line along the x-axis.
Data for countries could have been mixed up. Can you spot any such errors? Can YOU fix the spreadsheet to correct the erors?