It likely dropped off the front page due to:
1) Not enough upvotes
2) Lack of comments may be a factor in the scoring
3) Upvotes look suspicious, like a vote ring, so you have been penalised
For the numbers of votes (5) in the time given (an hour) on what is a working day across most of the world... it's actually surprising you got onto the front page.
With so little information, how do you expect us to help you? Do you want us to do all the work?
Added in edit: It appears that it's an identical URL to the one you posted just under 3 weeks ago, but with a different title. Perhaps the mods detected it as an exact duplicate and killed or penalized it.
Added in further edit: https://news.ycombinator.com/item?id=8221248
It still exists, but I suspect it has dropped down the rankings because it's an exact duplicate and has attracted a "duplicate penalty."
Added in edit: It is not a duplicate post. They all have Show HN as titles. The first time I posted, there was no news section. The news section was just added this weekend. Does that make it duplicate post?
Added in further edit. I see this post has also been taken of the front page.
And this post will have been hammered by flaggers - it's meta, and it will be perceived as complaining about flags, down-votes, or rankings. As such, it's regarded by many as "noise", detracting from the main point of "articles of interest."
The previous post dropped in rank because it set off the voting ring detector, hard. Users also flagged it.