They're clones yes? Most likely the virus. Unclean tools most likely.
I've been reading up a lot about this.
Are they rooted and all yes. If the mother isn't showing any symptoms. But can still carry and then later can be
But, if it's a constant issue. Then. Just retool up ditch buckets, bleach down everything. This shouldn't be an constant issue in a homegrown environment. Unless you have it. And passing it to mother, child, (tools to make children) and then carries on from there.
Did you buy clones from a site.
Hope you figure it out. Good luck