@eastofwest Hi, I found a pattern. If the CSV report can be downloaded directly on page, the data will be correct! But if the CSV report sent by email link, the data will be wrong.
I only use these two plugins:
– WooCommerce 5.1.0
– WP Mail SMTP 2.7.0
Theme: Twenty Nineteen 1.7 + WordPress 5.5.3
For your reference.