Background image slight movement/transform tool moves object on selection

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I'm noticing the locked background image I am tracing over top moves occasionally still. The jpeg I am tracing is on the layer below and lowered in opacity and locked. You can see it in this video when I dragged the toolbar over top the recording area
Also, I noticed when I use the transform tool and click on an existing object, it moves slightly. I checked this against the history panel to see what happened each time I simply clicked on it. You can see this happening in the same video link as above.