This is related to #6 but is not a duplicate as it does not explain the incorrect 1W and 1M pool performance stats.
In the pool stats data returned from /api/pool-stats/all, it looks like the API endpoint has been stubbed out to return the same data for both the daily and weekly stats:

This will affect the calculation of yearlyPerformance, which expects to operate on an array of weekly aggregates, not daily data.