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Looking at the measure, the only thing that jumps out at me that could cause a change in the unmet hours of your model is the timestep change. This measure changes the timestep of your model to 4; the following is from a comment in the measure.

set the simulation timestep to 15min (4 per hour) to match the demand window of the tariffs

So depending on the timestep of your initial model, this could have unintended consequences. This is why it is important to read the "Modeler Description" to make sure the measure is doing exactly what you expect to your model. And if that does not explain it well enough, you can always look at the ruby code in the measure.rb file and see for yourself what changes are happening.