There should be a verify step before making changes on the stats.
Idea 1: You have to press a "are you sure?" "yes/no" before stats get changed, typical solution rpg games use.
A button to "apply" stats (A pop up message opens if the skill tab is being closed without the stats being saved yet, as a reminder "are you sure you want to close? changes won´t be saved").
Idea 2: The stats are able to be substracted for the while the UI of skill management is open (when closed, the stats are applied and won´t be able to be substracted). (Image altered, example, in this case the player has used points on archery and artillery, while the skill tab is open, the player can modify those stats).
I prefer Idea 2 over idea 1 but both could cohexist as a double check for stat management safely.
