I suppose you already have mass markings 3? Because of the limited slots allowed in the markings.cfg file, markings near the end start to "repeat" with the default markings. An easy fix to this is to simply put your marking's script somewhere in the middle of the markings.cfg file located in the main Feral Heart file. There's no fix for the the limited spots issue sadly. If this doesn't solve your issue, maybe a screenshot will help us find a solution to your issue so we can see what's happening.