RO high pressure pump

Dear members, We have an RO plant that the high pressure pump was supposed to work at 12 bars at start-up regarding the projection software report, but it's working at 14 bars (both @21 C & same TDS & recovery) to get design recovery. Have you experienced such difference between real operation condition and software report before? Or, there is an unforseen problem here? #Hydranautics #RO_Membranes