Opacity - gray border while importing alpha

I'm pretty new to the software, i think i might be doing something wrong. I wanted to import an alpha on top of a opacity layer and there is this pesky gray border around it. Shoulden't it be transaprent? I've tried to play with blending modes, I also tried using an anchor.

The only thing that i came up with is manually painting it out with a mask, but thats not precise..

Can someone help me here?

Without the opacity layer underneath, everything works as intended, there are no gray borders.

 Alpha with opacity channel on and off.