You can verify your application package with Sniffer Installer Reporter (SIR) for Application Gallery; you can find instructions for downloading and using the SIR tool at the following URL:
Sniffer.Installer.Reporter (SIR) for Application Gallery
https://blogs.iis.net/kateroh/archive/2010/01/25/sniffer-installer-reporter-sir-for-application-gallery.aspx
Please report any issues to appgal@microsoft.com.