OCS Inventory NG Agent for Android not inventorying all softwares

Dear All, 

I have downloaded in Github the Android version, sign the APK, add the system signatures, aligned the APK and pushed to /system/app/ in a tablet that is rootable. When I inventoried the tablet it missing most of the softwares that are installed. What could be the problem? What apps/softwares does OCS Inventory NG Agent for Android  send to the server? Do they actually inventored system apps? 

Github code#

https://github.com/OCSInventory-NG/AndroidAgent/blob/aa0916f36572e13247b1d9d5609b7293ab660945/app/src/main/res/values/strings_prefs.xml#L49