Based on the following comment in T141506, we need to look closer at our Hive query in wikimedia/discovery/golden for counting web requests that are supposed to be wikipedia.org pageviews.
Your query has couple issues : does not filter self-reported bots and it does not filter by http codes. A pageview should always be a 200. Please open another ticket cause your issue seems slightly different.
Indirectly related issue: T143045