For me, I figured out a few reasons why I cut just as much, if not more, when my mood is pretty good. One is that it is a control thing. Sometimes I don't feel like I have much control of anything in my life, so I cut because I can control it. Another reason is that cutting is very addictive. Another reason is that I've been depressed so long that it has become familiar. Feeling neutral or pretty good is unfamiliar, so that causes me to cut. If you are able to go back to your therapist, it would be good for you to talk to them about it.