I have not been able to find a answer in trouble shooting.
Recently my Lightroom (v6.10) has started acting strange. When I select a image (that has been edited), then highlight another image and press the Sync button, the settings I UNSELECTED in the pop up box (in this case brushes and gradient filters are unselected as they pertain to a specific image and i don't want to copy that over), STILL copies over to the next images when I press the sync button.
I have not had this problem before on the same version of LR, if just started happening randomly a few weeks ago. Another friend now has this problem with the previous photo's brush settings copying cover even when that is not ticked.