General :: Galaxy S3 Modified Status Coming Even Without Rooting Ever?

If u still don't understand what I am trying to ask here is the full story

Brother I am on stock jellybean I have never rooted never flashed my device it says this after the official jellybean 310 mb update and I have already has a fight with Samsung over this 5 months back approx whenever I got the phone it so happens that this piece is a replaced one the previous one I had had problems with it so I got it replaces and as soon I got it replaced and opened it (it came sealed like a new one) sir I let the Samsung care guy update the firmware via Odin and I never saw what the status was when it came so I had a fight with Samsung I said they gave me a modded phone out of the box and they're fuse to accept saying that the piece was new and whatever happened just have been done by me... They refused me another replacement and since then the status of my device fluctuates between modified and normal once every few boots.. But it never gave me this dialog saying that my device is modified and I will not be able to update ..

In download mode
It said custom binary downloads no
Current binary Samsung official
Custom binary downloads no.
Current status custom

And in kyu phone setting.also ur is said status as custom Why is this so I have never modified my device nor rooted The above is one half of my story the other half is when.I open download.mode.it says

#manuak mode #
Apply multi csc
Applied csc code INU
Successfully applied multi csc

And when I try to check software upte via settings it shows this

So what he he'll is wrong with ny device i only ran the official update... Will I get warranty I have never hacked nor modded And this screen which I am getting in download mode is bit the normal one