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There are several reasons why you may not be seeing all sales in Facebook reports:

Delayed reporting: Facebook reporting is not real-time and may take up to 48 hours to update. Therefore, if a sale was made recently, it may not yet appear in your Facebook reports.

Cross-device attribution: Facebook may not be able to attribute all conversions to the correct device if the user engages with your website or ads on multiple devices. In this case, the conversion may not be reported in Facebook.

Ad blockers: Some users may have ad blockers installed on their devices, which can prevent Facebook from tracking their activity and reporting conversions.

Data discrepancies: If you are using multiple tracking methods, such as a Facebook Pixel and a third-party tracking tool, you may see discrepancies in your data due to differences in attribution models and tracking methods.

Data privacy restrictions: In some cases, Facebook may not be able to report on certain conversions due to data privacy restrictions, such as when the user has enabled the "Limit Ad Tracking" option on their device.

1. Delayed reporting: Facebook reporting is not real-time and may take up to 48 hours to update. Therefore, if a sale was made recently, it may not yet appear in your Facebook reports.
2. Cross-device attribution: Facebook may not be able to attribute all conversions to the correct device if the user engages with your website or ads on multiple devices. In this case, the conversion may not be reported in Facebook.
3. Ad blockers: Some users may have ad blockers installed on their devices, which can prevent Facebook from tracking their activity and reporting conversions.
4. Data discrepancies: If you are using multiple tracking methods, such as a Facebook Pixel and a third-party tracking tool, you may see discrepancies in your data due to differences in attribution models and tracking methods.
5. Data privacy restrictions: In some cases, Facebook may not be able to report on certain conversions due to data privacy restrictions, such as when the user has enabled the "Limit Ad Tracking" option on their device.

To ensure that you are seeing all sales in your Facebook reports, it is important to set up your tracking correctly, use a single source of truth for your data, and analyze your data over time to identify any discrepancies or trends.