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Thank you Peter!  I contacted Sucuri's technical support and they made a change to their settings which fixed the problem.

Thank you Andreas for your response. According to Peter's response below, it's due to Sucuri's use of Javascript to redirect the website. My worry is that if I disable Sucuri's redirectors, I'll end up with two instances of the website (www vs. non-www).

Thank you Peter for your response. If I disable the redirectors, won't that cause me to have duplicate pages (www. vs. non-www pages) again?  If so, that's not good either. Trying to figure out how to disable the error without having two instances of my website.