Ghosting 7 months after enhancement - what could be the problem?

Hi, I have had Relex 7 months ago. 4th month follow up: Right eye 0, left eye -75, 0.25 astigmatism. Doctor perform an enhancement (ent circle, femtolasik tech) 3 months after: Left eye +0.50 with no astigmatism, with ghosting. Consulted the doctor, trial +0.5 spectacle, image is sharper but doesn't fix ghosting. He got my eye dilate, said all is fine. Got second opinion from scleral lense fitter. He did some test and rotating machine and said everything looks fine. What could be the problem?