Substance 3D painter V9 baking uneven

Hello!  I'm trying to make maps for a top that's in three parts....Front, Sides, and Back.  For some reason the back bakes much lighter than the rest and I can't figure out why.  Has anyone experienced this?  Out of 3 maps two bake totally uniform, but not the third even though I'm using the same settings.  Pic below.  Thank you in advance.