I have no idea what happened here, but it may be that test are sometimes loaded a few days later.
For example here in Argentina he had a huge peak on October 1st 2020 https://ourworldindata.org/explorers/coronavirus-data-explor... but it's not a real peak. Some death reports were misplaced and found later and loaded into the system that day (or the previous day, I'm not sure about the details).
For example here in Argentina he had a huge peak on October 1st 2020 https://ourworldindata.org/explorers/coronavirus-data-explor... but it's not a real peak. Some death reports were misplaced and found later and loaded into the system that day (or the previous day, I'm not sure about the details).
Edit: Apparently the timestamp is the date of download. More details in https://news.ycombinator.com/item?id=29892505