locked drawings on the same layer?

I’m animating by hand in a single layer with a Wacom tablet. I trying to adjust a previous e drawing but it seems locked. Does anyone know what this could be? I have been testing out hot keys and possibly hit something, I don’t know.


Also the layer is not locked.

You most likley switched from color art to line art, or vice-versa. just below your camera view after your zoom % there are 4 circles; a white 0,a squiggle, a green circle and a U. Click the different ones to see if you can select in the other views. I do it all the time ^_^.
You can copy the one that isn’t what you want and paste it into the propper view.