First time this happens to me.
When I try to edit I purchase api for sms gateway I have implmented in php. when i execute in localhost it shows error?, the title part is immediately erased:
Actually, the revision history is incomplete: https://stackoverflow.com/posts/26826667/revisions
It shows that the question was asked after the comments: https://stackoverflow.com/posts/26826667/timeline
That's highly likely a result of an edition of the history by a moderator.
Google Chrome 62.0.3202.94 (Official Build) (64-bit) on macOS 10.13.2 (17C88).