When I click on network indicator in notification area, the indicator shows speed over 12GiB or 100MiB while I have only 4G network that can reaches 4.5MiB (mega bits), the same problem is with KSysguard which shows graph that reaches 16GiB ! is there any problem with units or those apps are buggy ?

I can confirm this, and I am pretty sure this is a bug in the units settings of the network manager