Charts doesn't work anymore after switching to data federation


I’m trying to switch from live production database to Data federation virtualDB in my Atlas Charts.
I setup everything correctly (data lake with data ingestion from backup / data federation based off data lake …) and i mimic-ed the live production db into the dataLake / data federation.

The issue I have is when I switch a chart data-source from live prod DB to virtualDB => i get issues like missing column / data, ‘null’ data, …

Is there any tips / idea about what can be the issue?