Aftering editing a perk tree in Creation Kit, saving turns them into invalid perks.

[dragon3025]

I'm trying to alter the smithing tree to include perks from Vokrii and Smithing Perks Overhaul. After I make all the changes it seems fine, but when save the mod then load it in-game, there are perks and connections missing. When re-load the my mod in creation kit, some of the modded perks now say "Invalid Perk".