Walmart's API only provides Sponsored Search report data up to 2 days before today. On top of that, Funnel downloads Walmart data once a day, at around 11:00-11:30 AM Eastern Time (ET). Before that day's download runs, your data in Funnel can look 3 days behind. This is expected.

Backfills can't fetch newer data. A backfill or historical re-download is limited by the same API window. It can't bring in any date later than 2 days before today.

Attributed metrics keep changing. Metrics with 3, 14 and 30-day attribution windows can change for some time after the first download, because purchases keep being attributed to earlier ad activity. Funnel re-downloads recent dates automatically to pick up these changes, so recent attributed values may go up until the attribution window has passed.