PvP Macro not working

Hello.

I am using PvP macro ingame, so that it would use CC on @focus person, instead of a targeted one. All of the spells work, except Wyvern Sting.

Macro looks like this:
/stopcasting
/cast [mod:shift, @focus] Wyvern Sting; Wyvern Sting

As mentioned, any other spells like Silencing Shot, Scatter Shot, Tranq Shot works with the same exact macro, but for some reason, Wyvern Sting does not (does not shoot at @focus person when holding the shift).

Any ideas what’s happening and how to fix it? Used to work until i transfered the character and the old macros deleted themselves for some reason