Ну давай изучим мат. часть:
Poppy can activate Steadfast Presence to gain movement speed and stop enemy dashes around her. If a dash is stopped, the enemy is slowed and grounded.
Ульт Раммуса
SOARING SLAM Rammus hops into the air and slams down at a target area, dealing magic damage and slowing enemies. If cast while Rammus is in Powerball, Rammus knocks up enemies near the center as well.
Ульт Варвика
INFINITE DURESS Warwick leaps in a direction (scaling with his bonus Move Speed), suppressing the first champion he collides with for 1.5 seconds.
Ульт Мальфита
UNSTOPPABLE FORCE Malphite launches himself to a location at high speed, damaging enemies and knocking them into the air.
Ульт Волибира
STORMBRINGER Volibear leaps to a target location, Slowing and damaging enemies beneath him while gaining bonus Health. Enemy towers near his landing location become temporarily disabled.
Ульт Кледа
CHAAAAAAAARGE!!! Kled and Skaarl charge to a location, leaving a speed-granting trail behind them and gaining a shield. Skaarl locks onto and rams the first enemy champion encountered.
В описании вышеупомянутых тобой ультов отсутствует слово "Dash", поэтому неудивительно что скилл не работает.
Тем временем ульт Ари
SPIRIT RUSH Ahri dashes forward and fires essence bolts, damaging nearby enemies. Spirit Rush can be cast up to three times before going on cooldown.
В описании есть слово "dashes", поэтому STEADFAST PRESENCE работает на ульту Ари.
http://old.reactor.cc/post/4928764
Poppy can activate Steadfast Presence to gain movement speed and stop enemy dashes around her. If a dash is stopped, the enemy is slowed and grounded.
Ульт Раммуса
SOARING SLAM Rammus hops into the air and slams down at a target area, dealing magic damage and slowing enemies. If cast while Rammus is in Powerball, Rammus knocks up enemies near the center as well.
Ульт Варвика
INFINITE DURESS Warwick leaps in a direction (scaling with his bonus Move Speed), suppressing the first champion he collides with for 1.5 seconds.
Ульт Мальфита
UNSTOPPABLE FORCE Malphite launches himself to a location at high speed, damaging enemies and knocking them into the air.
Ульт Волибира
STORMBRINGER Volibear leaps to a target location, Slowing and damaging enemies beneath him while gaining bonus Health. Enemy towers near his landing location become temporarily disabled.
Ульт Кледа
CHAAAAAAAARGE!!! Kled and Skaarl charge to a location, leaving a speed-granting trail behind them and gaining a shield. Skaarl locks onto and rams the first enemy champion encountered.
В описании вышеупомянутых тобой ультов отсутствует слово "Dash", поэтому неудивительно что скилл не работает.
Тем временем ульт Ари
SPIRIT RUSH Ahri dashes forward and fires essence bolts, damaging nearby enemies. Spirit Rush can be cast up to three times before going on cooldown.
В описании есть слово "dashes", поэтому STEADFAST PRESENCE работает на ульту Ари.