How/why would one of my own questions be edited by someone else?

It has gone to moderation. You will probably be getting a message from the mods.

Correction… it’s one of my answers that’s being edited that has already been responded to by many people. Do mods do that?

Oh, now I understand. The original question, which wasn’t mind, is being edited, not my answer. Got it.

Just for the record, all of the moderators and staff have the ability to push a question back to the user, for them to edit.
Only the staff and the original asker are able to actually go in and edit the question.

Oh, good. I was worried for a minute there!

You don’t think there’s a maniacal editor on the loose, running around and wreaking havoc?

Stealth Mod Gremlins who want to control everyone, even if it is only in a virtual world.

We prefer the term Stealth Mod Ninjas, thank you very much. :p