It still is Dave to some degree though your avvy is now innocent as were you yourself, lol. There wasn't a problem when http was the norm across the net, I too and many others will likely have historical posts containing http on the site. The problem arose when the net changed to https and some browsers and security suites began to flag up warnings against this site and others where http is detected. Some members could not log in to the site as a result and that might still be the case for some. Your avvy did present itself in http but that has since changed and it now presents in https and it no longer triggers the padlock and security warnings in the address bar near the top of a browser. Your avvy was not the only source of an easily correctable http problem on the site, some members still use it for reasons known only to themselves even though some of them must know by now of the problems it causes for other members and the site itself.
I was being generous to the site in suggesting that the hand of mod might have intervened in changing your avvy to https. More likely the case is that the pic used in your avvy is hosted on a platform which has since adopted https - unless you changed it yourself which is very easy for any member to do in their own profile.