Meta skill type Problem

I was wanting to incorporate a permanent meta type skill(tried meta, destroyer form etc) where the hero turns into a similar but stronger version or whatever. This in itself works fine, the unit changes and retains any learnt skills, but when the hero levels after this, the original meta-type skill shows up again for learning, though a point in it doesnothing. If you learn it the skill becomes the faded version(like when u dont have the level req met for a ultimate) until you level again, and then it repeats and u can put points into it again.

It doesnt show up in the regular abilities field after its first used, only the place where u put points into it, can someone explain why this is and how it can be fixed? thanks to anyone who can help

Hmm, ive figured out its linked to checking the "permanent" option(double click on the unninteruptable feild) Ive tried to use the remove ability trigger but its not there till the unit levels, so i guess ill just have to run it everytime the unit levels, still can anyone explain why this happens? and possibly a different route to fixing/preventing it?