Color Management Shifts Monitors and Output

Our team successfully finished doing color for an Amazon documentary in Resolve with Davinci Wide Gamut, all setup properly from inputs to outputs in Resolve. Returning to export the show, no changes to the setup, color were muted and light levels darker a stop or two. All monitors are calibrated correctly and show this issue, as well as the output file. This is becoming almost regular in our efforts to color and export.
Any engineers/BMD team that can address this?
Any engineers/BMD team that can address this?