i am betting it is your light try moving it furter away than you have it now.i have a bubble cloner also and have 2 shelves in my veg room on top shelf i have my lights on the bottom shelf is the cloner with no direct light on the cloner.and usually have roots in 5-10 days.or possibly trim away some of your leaves that will also help as the cutting will not be able to absorb as much light