Just the aberrant banding? Don't know about Leos (-if it means anything?), but markings in snakes typically vary.

Do you know the genetics of yours- are they all "normal" type? Because here's one with odd tail markings: https://www.morphmarket.com/us/c/rep...-geckos/779256

So maybe there is something going on??? But I'm just throwing that out there- not saying there is. I guess you'll "have to" keep breeding these guys to find out?

(Gosh, I'm a "bad influence", hahaha!)