My theory is this;
they're just 3 stars in close visual proximity, one blue, one red, and one white with coincidental orientation.
The false green overwrote the white star due to input by your processing, and the blue and red star are normal.
I checked various incarnations of the DSS archive in both blue and red wavelengths. Depending on which I chose, one object was visibly reduced, or disappeared.
I suspect the third image link I posted perhaps DID show those three stars, if very faintly due to conrast adjustments done to bring out the luminescence of the Supernova (which was the focus in that picture)
Because of the coincidental orientation and similarity in size, aided and abetted by the greenish colour of one of them, you can see how if one assumed you'd done each colour individually in short succession how it might have been interpreted as a moving object.
False alarm. Pity that.