Download as zip - Not downloading all files

[SG]

Using Alfresco 5.1.

I go to the Share user interface, go to documents, then to document library, then choose a folder and click download as zip. It downloads as a single zip file, but not all the files found under that folder. It goes to the sub-folders but does not download all the files. The sample that I am testing with has only about 30 small files with three levels of sub-folders. It navigates to the sub-folders but does not download all the files in a sub-folder. For example, if a sub-folder has 6 files, it only downloads 3 files. It is doing this consistently and always downloading the same exact set of files (and does not download the others found there).