HSX uses a box office reporting service (called 'ERC') for its box office reporting.
Movies that report box office to ERC get delisted and attached starbonds get adjusted using the ERC numbers.
If a movie does not report box office to ERC, then the starbonds are detached and do not adjust, and then HSX can use a secondary source (like BOM) to delist the moviestock (and this is done solely for sake having accurate historical data)
The weekly ERC box office report is located on the green HSX Navigation Bar > News & Events > Box Office
Wonder Wheel stopped reporting box office to ERC on 12/18/17 (link), so that is the amount that it delisted for and the amount that the attached starbonds will adjust for.
Here is something to read about this:
http://hsxsanity.blogspot.com/2012/10/what-is-erc-what-happens-when-movie.html