White edge line on cropping and scaling

I have a SONY F65 OCN footage in a resolve 15 studio project. The project is HDR.
The resolve system is in windows 10.
I am trying to do a picture in picture of two elements with scaling and cropping.
On the smaller image (the picture-in-picture) I see a white line a pixel thick, that surrounds the image.
Is this an issue of scaling? Or could it be an artifact of working with Sony F65 OCN?
Any help is greatly appreciated.
Thanks!
The resolve system is in windows 10.
I am trying to do a picture in picture of two elements with scaling and cropping.
On the smaller image (the picture-in-picture) I see a white line a pixel thick, that surrounds the image.
Is this an issue of scaling? Or could it be an artifact of working with Sony F65 OCN?
Any help is greatly appreciated.
Thanks!