Glaceon's Permeating Chill doesn't work consistently

As the title says this move doesnt work consistently. It does 30 damage and says "At the End of your opponents next turn, put 9 damage counters on the Defending Pokemon." The intitial 30 damage always works but the extra 90 does not.

Sometimes it works when the opponent switches pokemon, sometimes it doesnt. Sometimes it works if i knock out the defending pokemon with the initial 30 and then they switch in a new pokemon, sometimes it doesnt. Sometimes it works when i switch out Glaceon, sometimes it doesnt. Sometimes it works when Glaceon is knocked out, sometimes it doesnt. etc.

at first i thought there was some pokemon power or trainer overriding it but this doesnt seem to be the case and its happened consistently in every match i've used it in. sometimes it just doesnt work. and i've lost multiple matches because of it.