I have one field in a profile that converts the letters 'pez' into a fish symbol. It doesn't happen anywhere else throughout the site. Any suggestions on why this is happening and how to fix this?
This does not happen out of the box in WordPress. I would recommend going through your plugins one by one and deactivate them to see which plugin is causing this.
After that if it still persists, try switching to one of the themes that comes with stock WordPress. If the issue goes away there then there is something in your theme causing this conversion.