Community username was changed?

My Forums username was changed without my knowledge or consent. When I look in my Profile, the username field displays the new username, but the field is grayed out, no access to change it back. Who would have the authority to make this change?  No one on god’s green earth has access to any of my accounts, but even if they did, the grayed out username field would bar an outsider from changing it. Ten years with my original username, and in the last 4-5 days days it has mysteriously changed. It’s creepy and unnerving, Comcast. I know the change happened in the last 4-5 days because that’s when I logged on to post about my internet/tv/phone being out yet again, and I saw my username was the same old name. Before I completed writing that post, everything came back online so I discarded my draft post. But tonight, Tuesday 10/24/23, internet/phone/tv all went down at about 10:00pm. I reset modem and router to no avail. Help me, Obi Wan(s). You’re my only hope.