removing tinny sounding voice

I have recorded a video using my laptop with the app OBS studio to record. The audio started recording fine, and then half way through my voice started sounding tinny. I am using olive tree for video editing and could not remove the noise on that. I have tried on audacity but can’t seem to do it.
I have attached a small clip to give you an idea of the sound. I would like to get rid of it so I sound normal.
Your help is appreciated. :smiley: