It seems poise are not adding correctly to to SESM, in the images below captured from a video, I can see that 2 evades with dexterity granted me only 1 poise charge :
Before combo - 6 charges

First dexterity on medium, gained 1 charge


Second hit evade with dexterity - still 7 charges


I have the video as well from which images are taken.
Ingame : juliiiiien
Device : iPhone 8
System : iOS 12.1
MCOC : 21.1
Wifi network