I've been using AE for about 20yrs now and never encountered this I think. Selecting a layer from the timeline (a photo image) that has an ellipse mask applied to it. As usual the mask is not locked. I am sure to select the layer, not the mask. In the viewer I attempt to move the layer image but all it does is warp the mask shape, i.e., two of the beziers are adjusting length and angle. Even if I select right in the middle of the circle. Even if I am zoomed right in.
I can't think what I might have switched on to cause this effect. I'm sure it is handy at times but right now I have to keep locking and unlocking my masks which is not very productive.
Any ideas? Have you come across this in the past? What is it that I've switched?