I spent specialization cleaner to see what specializations I could choose...

[VELTONS]

and they didn’t give back to me, even when I chose same one, although description and logic say otherwise

I can't stop laughing at devs... I'm even glad that game will die in 2 weeks

[DarkEternal]

When you press F to confirm that you want to use the Spec reset, it's gone! You don't get it back! It basically says: "You wanna do this? Press F if you're sure!" And you pressed it and now you're big mad at the game for your own mistake.
Thanks for the laugh!