@Inig0 :

Insofar as the Off Balance status effect (supposedly) lasts 5 seconds "universally", the Skills UI tooltip for the Deep Breath ability apparently does have a typographical error.

However, what the tooltip discloses when a player places the mouse cursor on the Deep Breath icon, showing it equipped, on the Ability Bar is what the duration of the status effect should be when the ability affects a target. If that tooltip, too, states that the duration is two seconds instead of five, then there is a typographical error in both of the respective tooltips -- assuming that the duration of Off Balance is actually five seconds after the ability is used during play.

Else, if the Deep Breath icon tooltip states that the duration is five seconds, then perhaps some modification occurs that increases it when it is equipped. Patch Notes don't always agree with what players see in the game, or, rather, they often don't describe exactly how the feature is implemented.