I'm using Scopus API to extract information about academic papers. However, it's showing something very strange. According to Scopus, many articles are published in the future → see the screenshot. The example shown here was actually published on 5.01.18 according to Springer. Is this an error/bug or have I misunderstood something?
The article was brought online on January 5th 2018 as shown in your Springer link.
But it will be officially published in Journal of Economic Structures 7:1, which will be published in December 2018.