Help unlocking comet strike tier 5

[Yulie]

So it says I need to have unlocked the achievement "hongmoon secret technique - comet strike" in order to allocate a skill point to tier 5 comet strike...

 

However I believe I have already unlocked the achievement...

 

But it wont let me put a skill point on tier 5. Is there something I've missed out?

[RainbowDashie]

yeah you missed that you need 2 skill points for each hm skill.

[Yulie]

thank you!!!