I bought two dead leaf mantis a couple months ago and one is not molting. The other one is on a normal molting schedule and is much bigger. They have identical tanks. Same size, same temp (80 degrees and drops to 70 at night) and same humidity. Somewhere between 50-70%. It seems healthy, active and eats on a regular basis. They have a leaf litter floor with fake vines. I left plenty of room for molting at the top. Just wondering if there's something I can do or if there's something I'm doing wrong? Thanks