Standard Editing rules do not allow the sort of compositing you did here. You are allowed to eliminate objects in the image in various ways, but you cannot introduce new elements into the composition. Regardless of whether this is the same image pasted in a new layer or not, it is effectively a double-exposure composition, and would only be legal in Extended Editing. In addition, you have a problem with what you think are your original JPG files, because they have been modified by Lightroom and no longer have a valid time stamp :-(
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