I fixed an obvious grammar mistake in a post. The author rolled it back to the incorrect version. I thought grammar edits were encouraged since the improve the post even if in a small way. Why would a post author deliberately roll back to an incorrect version?

https://askubuntu.com/posts/222855/revisions

I fixed an obvious grammar mistake in a post. The author rolled it back to the incorrect version. I thought grammar edits were encouraged since they improve the post even if in a small way. Why would a post author deliberately roll back to an incorrect version?

https://askubuntu.com/posts/222855/revisions