Guild Wars 2

Literally every time I pop dolyak signet (10 stacks of stability) to stomp an engineer, their 2 skill blows through all of my stacks and then stuns me. Pretty certain this is a bug and is not intentional. Might be something to do with them channel the skill before the stability stacks are presented or something?

No, I think what you experienced was something quite different :

https://wiki.guildwars2.com/wiki/Always_Prepared

ie, you stayed in the slick shoes while stomping so your stability stacks melted away. Then he could cc you