It must be a dialogue bug. The dialogue is suggesting that you used the powers, when you never actually did. So don’t worry, I don’t think this means that you actually used the powers.
I’m not surprised that Minthara’s dialogue is buggy. Her whole new recruitment process is pretty… unpolished right now.
Your dialogue bug is definitely worth reporting. As strictly a dialogue bug, to keep it simple. Apparently there are also larger-scale Minthara bugs (like a romance scene not playing and her accusing you of cheating when you never did).
