White ghost left behind after using Remove

Either reset the photo or create a virtual copy and reset ti (as in no edits, as in as imported). Hopefully with no presets etc. applied at import,  and try out the removal before accomplishing anything else. Does it misbehave?

This is a known issue if you have used a sky mask. The mask did not cover the object you removed later, so it now has a gap where the removed object used to be. The solution is easy: You need to update the mask (Lightroom shows this with a red dot underneath the masking icon). If possible, remove unwanted objects first, and then create the sky mask.