In the Pi-Hole admin panel in your browser, go to settings, then click the DNS tab. If you put the PIA’s dns settings instead of google or - heaven forbid - your isp, that will allow you to turn off PIA dns leaking in the PIA settings while enjoying the benefits of Pi-Hole. If you’re using your isp dns by default, you need to start from the beginning because your understanding of these tools was clearly flawed from conception.
One issue though when doing this, is trying to load pages that are blocked by the Pi-Hole but not dns. In that case, you. Need to allow the pia to take control of dns settings to go around the Pi-Hole’s dns influence.