Since a 'like' click is easily and instantly reversible, we do not need a confirmation screen, and an additional click for every 'like'. Thank you kindly.
Just heard back from the developer. "This happens when users click the Like control before the page has finished loading and the JavaScript has fully initialised." Does this happen to you every time? Do you have any ad-blocker software installed that could be blocking a JavaScript from PriusChat to not load?
I do (being sensible). Giving permission to everything on the page, fixes the problem. Thank You Kindly.