Sorry I need to be maybe a little bit more specific.
Let's say your're descending in FLCH and get a request to increase your descent or for example, I'm above the glideslope on approach and select 1500 FPM to increase descent, speed is good as soon as I select V/S the autothrottle adds power from maybe 1.00 EPR to approximately 1.05 EPR. Happens every time as it seems to be programmed into the system. Just a similar increase as you get when A/I is selected. Just wondering why..