I have seen a few examples where a person responds to their own post, but words it as a SWH...so maybe that IS the glitch that Jo W. refers to in another answer.....
Theoretically, someone could have several accounts (created with several email addresses) and using the exact same handle and/or name, location etc. and that might account for what you are describing.
Then there are the multiple accounts (different names, handles, etc.) that people seem to trot out when they want support, validation, extra flowers, help reporting an item.....that's the more "sinister" use of several accounts.
It's funny once you KNOW them for sure....certain "people" ONLY appear when their more well-known alter-ego needs a boost on an opinion, etc. But sometimes they slip....and forget....and copy and paste directly from O. of their "secret buddies" answers and present it AGAIN as a separate answer... Funny, really!
And it WOULD be nice to be able to send a BOUQUET sometime, wouldn't it!