Please explain: Passive-Tree-Points are jumping by their own - having the points to re-skill

Header says all.

Here some emotional information:
When the overview says 0 Global-Points & 1 for each Set available, i want take out one global from another position to split it onto both Weaponsets. When i want define it, the Tree begins to adapt by its own to recreate my setup, taking points out from where i explitly set them one instance before.

I dont understand what happens XD

Greetings.