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This indeed sounds like a perplexing issue. While I can’t give a definitive answer without more details, there are a couple of possibilities for the inconsistency in your data. When you drill down into more specific dimensions such as ad group names, the data might be restricted due to privacy reasons or data threshold by Google. The API might not return data on ad groups with low traffic or revenue to preserve privacy. Another potential issue could be bugs or discrepancies between different Google tools, including Google Ads, GA4, and the Data API. This happens occasionally due to differences in data processing and latency. That said, you might want to consider reaching out to Google support for further clarification. They may be able to provide more detailed diagnostic information.
