Blighted Map Drops in Higher Maps

When running T16 blights I am getting a ton of seemingly random tier blighted maps out of the blight chests. I don't think this is from blightreach but it could be. For example I just ran a T15 Mesa and opened a blight specific reward pustule and it dropped a T3 blighted map. Is this a change for this league or is there something wrong with the tier of drops?

Thank you!