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There could be several reasons for the discrepancy you are encountering. One possible explanation might relate to the scope of your query. Make sure that both sets of data are pulling from the same time range and include all necessary event parameters and user properties.
There could also potentially be issues with bots and spam can cause outliers in web traffic data. You would need to filter out this bot traffic.
Another possibility could be the differences in the data collection between GA4 and Big Query. GA4 data is usually sampled while Big Query exports are raw. Therefore, the way you’re querying data in Big Query might not match how GA4 processes and presents data on the GA4 interface.
Lastly, data processing latency can be a factor to consider. BigQuery might have more up-to-date information than what’s shown in your GA4 dashboard, especially if you’re checking it in real time.
You might want to check if there are any duplicate pageviews occurring, this can be caused by duplicate tracking code implementation, website redirects, or instant reloads.
If none of the above work, contacting Google support might be your last resort. Although the issue is quite complex, I hope this would guide you closer to the answer.
