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Hello @jaanahelminen
Thank you very much for using our plugin. I tested your form, and you are using the PREC operation without the second parameter:
Ex. prec(fieldname12-fieldname13-fieldname7)
If you use the PREC operation without the second parameter, the plugin rounds the value to an integer number.
If you want the result with two decimal places, the correct one would be:
prec(fieldname12-fieldname13-fieldname7, 2)
This problem is present in all your equations.
Best regards.