The parameters will be differant every time you buy remixed salt at the store. If they got their measurements wrong all the parameters are messed up. I would recommend finding a salt mix that matches your tanks parameters and buy it separately and just pick up RODI from store and mix it yourself so its consistent every time.
I had great luck with red sea blue bucket, since it was almost identical to the current parameters at that time. Makes waterchanges super easy once you find the right salt. You can do huge waterchanges and nothing in the tank will be effected/shocked from swinging parameters.