“Data during this period are incomplete because of the lag in time between when the death occurred and when the death certificate is completed, submitted to NCHS and processed for reporting purposes. This delay can range from 1 week to 8 weeks or more, depending on the jurisdiction and cause of death.”
You need to check the notes at the bottom of the chart. The deaths always look low for the first 2-3 weeks. Only about half the jurisdictions report their deaths to the CDC within the first 10 days. Many take 2-3 weeks or longer. The numbers get adjusted as new reporting arrives. This always happens for every cause of death.
Then there was severe underreporting for last week. I look at this chart several times a week, and last week was lagging way behind all week, when prior weeks (at the start of a new week) were more or less what you see here.