Thumbnail personalization spreading impressions equally across all thumbnails

Impressions suddenly started being spread equally across all thumbnails without any input, even if there was/is a clear winning thumbnail. Appears to occur for all games.
Game 1:


Game 2:

Expected behavior

I would expect more impressions to be given to the thumbnail with higher QPTR over time.

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We had an incident that we’ve since fixed as of an hour ago - apologies about this.

We are putting mechanisms in place to avoid this happening again.

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