Article citations do not show issue number in Bibliography

[mapto]

As per the template (see rendered), the bibtex

@article{Kirschmer:2010:AEI:1958016.1958018,
   author = {Kirschmer, Markus and Voight, John},
   title = {Algorithmic Enumeration of Ideal Classes for Quaternion Orders},
   journal = {SIAM J. Comput.},
   issue_date = {January 2010},
   volume = {39},
   number = {5},
   month = jan,
   year = {2010},
   issn = {0097-5397},
   pages = {1714--1747},
   numpages = {34},
   url = {http://dx.doi.org/10.1137/080734467},
   doi = {10.1137/080734467},
   acmid = {1958018},
   publisher = {Society for Industrial and Applied Mathematics},
   address = {Philadelphia, PA, USA},
   keywords = {ideal classes, maximal orders, number theory, quaternion algebras},
}

translates to

[28] M. Kirschmer, J. Voight, Algorithmic enumeration of ideal classes for quaternion orders, SIAM J. Comput. 39 (2010) 1714–1747. URL: http://dx.doi.org/10.1137/080734467. doi:10.1137/080734467.

Notice that the volume/issue information is 39 instead of 39(5).