Poor Description Erwin's Skill - Napalm

Upon leveling up to 21, I put SP points into a level 26 skill which really shouldn't appear unless I'm of level. I didn't realize I put points into this skill until I wasn't able to drag the move and read that it was a level 26 skill.

In Short - Able to put SP into level 26 Active Skill at level 21 but, unable to use skill.

Edit*

So at first I thought it was a level glitch but, KisugiAi help pointed out a minor problem to short out that it was not a glitch but, rather a poor description. The description of the skill "Napalm" for Erwin is actually great but, unclear and not discrete when it comes to using it.

Here's how the Napalm controls read: Press the hotkey whilst in the air (Airborne skills are automatically added to the quick slot).

It took me a while to figure it out and I bet some players would go their lives having this skill never knowing how to use it lol.

Update Edit*

O.k, so it turns out Napalm is actually it's own skill and unrelated to any other skill. You can't drag the move to any hotkey, but when you jump it automatically shows up on a hotkey with no correlation towards any other skills. I repeat, it is its' own skill.

Quote from KisugiAi

Are you sure

cause the lvl singn under the skills are an info foe the next

its mean you can put in the next point then at lvl 26

and one skill you cant put in the task bar this wil movet automatic but thi first a few level later

It took a while to understand what you were trying to say but, I figured it out. Turns out it's not a glitch and the skill is also not very clear about what it does because it also doesn't branch off from another skill. The skill I'm using is called "Napalm" for Erwin; to activate, it requires you to jump and use another skill aka "airborne skills" but, how da heck are we suppose to know what airborne skills are airborne?

The description is just not very discrete. Gonna have to change the thread to poor description, ty.