May I ask who's / what type of rollers they were.
I'm going to write a very long list of things to check when you guys are getting your vehicles power measured on rollers 
Then I'll make it sticky 
they were dyno dynamics (4WD). the place i went they dont concentrate on big figures but the car running sweet... 
I will be going back for another in a few weeks too... so will defo post before and after results
I hear you, but they are not actually writing the software and they can't have any influence over the car running sweet or otherwise as they are installing a pre-set pre-made product.
The important things to note on the dyno are where the air temp probe is and all of the information on the bottom of the dyno plot
See below:
First up on the rollers was a Mk5 Gti with a 'Stage 2' Revo map, estimated power was 280-290bhp. Result:
