Craters don't give right amount when set to the same value at minimum & maximum PmSolved

Hey! It's been a while since I used this plugin.
I set
"Mineral Item Short Name": "stones",
"Chance": 60,
"Minimum pM": 150,
"Maximum pM": 150

but I get different amounts when using the Survey Charge. They are all under 150 and different but they should be all 150 right?
The same with all other resources.
I set the minimum the same as the maximum to make sure they always have the same output but this doesn't work.

The only thing that gives exact the same amount is the oil crater.
It's always 4.5.
"Minimum pM": 4.5,
"Maximum pM": 4.5

But why does this not work with the other resources?

Seems I found the solution.

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