By viewing the edits, then checking the "source" option: https://dba.stackexchange.com/revisions/64cbb858-2af5-42f6-ab85-628f05198cbc/view-source
I see that what happened is your initial indent was (as submitted) at 3 characters on the left hand column.
I can therefore surmise that your original source had 7 spaces or that you inadvertently hit enter/delete at some unfortunate point and removed the space trailing the initial line.
Had you had 7, you pressing ctrl-k would have removed 4 chars from each line, thus making the first 3 chars, which is too short by one for the auto-code-formatter.
It's still there, in all it's glory, for you to go back and review.
Hope this helps, not sure precisely what happened.