I have noticed that "Android OS" consumes a lot of data on my phone (LineageOS 14.1; Samsung Galaxy SIII GT-I9300; rooted). However, this data seems not to count for the overall data usage. As you can see in the picture below, Android OS consumed 36.72 MB so far. But that is more than the total data usage at the top (28.11 MB). This determined total data usage is the same as my provider says. Is there a particular reason why the data usage of Android OS does not count? Has it something to do with Nougat or even LineageOS?
On the other hand, My Data Manager, for example, seems to take Android OS into account:
Does someone know the reason for this issue or does somebody have an assumption at least?