Copter climbs rapidly in stabilize mode

Hi, I have some issues in flight. I’ve build a new copter and trying to have a test flight, when I take-off in Loiter mode it seems pretty good, but when I change the mode to Stabilize mode the copter climbs up rapidly even if I set the throttle stick to the middle, what might be the problem of this issue?
Thanks.

I think you may have some misconceptions about Stabilise mode

Read the documentation.

Stabilize mode does not hold altitude at 50% throttle.
I think that the thrust of your copter at 50% throttle is larger than the weight of your drone, that’s why it’s accelerating upwards.

And if its something else then posting a LOG could prove more helpful