Problem with duplicate children

I have a problem, every time q fix the blueprint of one of the children of a component is duplicated, it only happens when when fixing the blueprint I have a failure to compile, when fixing the bug duplicates all the children, how can I fix it?

Not enough details to answer this. Examples?

The only thing that comes to mind is that you have a rogue Construction Script misfiring. Do you run it in any of the affected blueprints?