Haha it just looks high to me as I've never noticed them until recently.
Android OS alone has used 350 to 450MB of data per month according to my data cycle for the last 3months. And as of now, 5days into my data cycle, it has already used 80MB of data. (At my lowest data usage in July with 1.75GB, Android OS used 350MB out of it.

)
As for Google Play Store (which, as I said before, I have set to only update when there is wifi), 3months ago it used 45MB, then 70MB, then 110MB, and now 5days into the cycle, it's already at 50MB.
I have a 4GB data limit which might make these numbers seem inconsequential, but I would like to know what's happening because I nearly crossed my data limit last cycle and I rather it not be because of some things I don't even have control over, lol.
Any ideas?