Tattoo white ink oxidation. Should I discontinue treatments? (Photo)

Hello. I have had 15 sessions to remove tattoo with lots of white ink. have not had oxidation until now. session 14 white highlights beginning to darken. expressed concern to tech that maybe i should discontinue treatments and consider a coverup. But he feels we should continue and that oxidized ink will fade with treatments. I am not sold on either. Getting a coverup or treatments. I do not believe this is to get more money from me as i already paid in advance. Picture 3 before oxidation.