Thanks for your response, Patrick.
I don’t understand the issue, I don’t have any SEO plugin, and I have no idea what a “canonical url” is, but I shot a few shots in the dark, and for the record, what solved my problem was to change the ‘redirect method’ setting to ‘no redirect’ in Really Simple Security plugin’s SSL settings (and after exporting with Simply Static, I then set it back to ‘301 .htaccess redirect’.
Thanks again!
Juan