Grok used my voice! Is this normal ?

I stupidly thought about dipping my toe into the ai therapy game this morning and downloaded grok. This was my first time ever using it and it didn't go so well. I was having a conversation about some problem areas in my life. When it responded to me using my own voice, let me clarify, it didn't repeat what I had said back to me, it responded with an intelligent answer, using my voice and then when I questioned why it had done that, she denied doing it. It was all caught on my home security camera. I posted a tiktok video asking for advice and i've not got any responses so I thought I'd come here maybe to see if anyone had any answers? Is this something that happens? Im honestly freaked out.