A question about power analyzer tool

I have used power analyzer toll to estimate the power. But there are some values seems strange. One is when I reduced RETI instructions (only 3.48), it significant reduced much current ( the biggest reduced in those instructions), while in the resource usage report, it didnot reduced so much resouce, like logic elements or registers. Why it will reduce so much current? What possible cause this result? Another value is when I reduced all the instructions (3.72) which didnot been used in my test program, it didnot reduce the more current consumption than when I just reduced one of those instructions (like 3.53, 3.48 ) or some part which related to ALU (3.5), how could this happen? ALL the value on the garph are the value get by the power analyzer tool when reduced part of the microcontroller, like unused instructions, unused registers, unused hardware multipliers. The first "all" in the graph means nothing reduced, others are all values after reduced. Thank you very much.