Inconsistent multiple Cost and Usage Report created

Hi AWS and AWS users,

I am creating CUR(Cost and Usage Report) with the following configurations

• Default content
• Refresh automatically
• Report data time granularity : Hourly
• Report versioning : Create new report version

with the settings above, I was expecting a single report containing hourly logs to be created when AWS refreshes the CUR(up to 3 times a day).

However I am receiving multiple CUR in my bucket such as

• 20230312T081141Z

• MyCostReport-00001.csv.gz (55.6 MB)

• MyCostReport-00002.csv.gz (3.6 MB)

• MyCostReport-00003.csv.gz (1.9 KB)

• 20230314T152624Z

• MyCostReport-00001.csv.gz (58.3 MB)

• MyCostReport-00002.csv.gz (58.2 MB)

• MyCostReport-00003.csv.gz (4.4 MB)

• MyCostReport-00004.csv.gz (1.9 KB)

To sum up, I'd like to ask why

• Multiple CURs are created (with such different sizes)
• Numbers of CURs created are inconsistent (sometimes 3, sometimes 4)

I'd appreciate any help possible with the issue.

Thank you.