Ptra’s Protection boon is not being described correctly
As described in Patch notes
“Ptra’s Protection - Every 5 seconds, a Perfect Parry spawns an Orb that reduces Damage taken by 50% for 10 seconds.”
As described in Tooltip
What I think has happened here is the ordering on this list is muddled.
Top value is the damage reduction multiplier, -(-0.5) which becomes 50% and then treated as seconds.
Middle you have the duration (10 seconds)
Bottom is the trigger cooldown (3 seconds)
So putting the bottom line to the top should fix this.