pixels changing when using Edit>Transform>Warp
I am trying to apply Tranform>Warp to a layer and when doing so, the appearance of the image changes. It's hard to see but in the 1st attachment, the image is not transformed. In the 2nd, a Warp is applied and you can see more tiny white pixels in the red circled area. Is the image breaking up as a result of being transformed, or something like that? I have never encountered this before. Thanks.

