Moved this topic to bug reports as this is definitely something we messed up in the code when @Fernando-Gietz added the filter option to the reports.
@Rivybeast I am working on this and have pushed a first fix of the “Inventory Report”. If you are keen to give it a try you can simply download the latest file from github and put that into /var/www/html/fog/lib/reports/ on your FOG server (probably best to rename the existing file - e.g. to inventory_report.report.bak - so you can switch back to that easily just in case.
I’ll work on the other reports as well before I merge the whole lot back into dev-branch.