My comment on this [phantom/imposter answer][1] says:

>This is the **second time** this has happened to me, a second, identical copy of my answer appears, and I seem to be open and active when I return to this tab. I see it open, and click save before noticing that it is a phantom/imposter post. In this case I was in the review cue in another tab at the same time, though I'm not sure if that's related.

I'm using the Chrome browser with several tabs open, but I am now *absolutely sure* that I never clicked the `Add Another Answer` button. 

I thought I'd posted a question here the first time it happened to me, but I don't see it now. I'll see if I relocate the first double-answer (roughly a year ago).

**question:** How to make sure this doesn't happen again? It's not at all a major problem, I don't notice any adverse effects besides the poor aesthetics of having a second, deleted answer.

I haven't added the `bug` tag yet since I'd like get to the bottom of what's actually happening. The `bug` tag can sometimes attract a `by-design` labeler, who might clear up bugs by finding a plausible rationalization for the behavior, and thereby "solve" the issue prematurely.

[1]: https://space.stackexchange.com/a/25669/12102