I used tor to visit my own site and I got the warning:
This website … attempted to extract HTML5 canvas image data, which may be used to uniquely identify your computer.
Should Tor browser allow this website to extract HTML5 canvas image data?
tor developers explain to block it, but I am the owner of website and I want to stop such fingerprinting of my visitors. I don’t have any idea how to stop it.
Second, so your question is actually how to remove canvas image based fingerprinting from your wordpress page, have I understood that right? In that case, this forum is the wrong place to ask, I’d recommend a wordpress focused forum for this, as I can only guess, if you haven’t placed this form of tracking consciously, that it simply is a part of the standard WP configuration…
just setup a small WP installation to test, without any kind of theme, this seems to be par for the course with WP by default. The only thing I can recommend in that case, is to look for an alternative, or even better, code the page yourself. However I can understand why both might not be an option.