Did you try either doing a factory data reset or flashing the stock tar from sam mobile, after running triangle away and unrooting?
When I did it, I flashed this first, then installed and ran Triangle Away, then using Odin, falshed the stock ROM tar. Then did a factory data reset before sending it in to warranty.
Good Luck
---------- Post added at 07:27 PM ---------- Previous post was at 07:21 PM ----------
I noticed the same thing on mine recently. I had it all back to a zero'd flash counter, a binary status of normal, and a system status of normal in settings. But something happened along the way, and now I show modifed in settings and for binary status in download mode. Kind of a bummer after having it all cleaned up and fully rooted at one point.
Anyway to check the flash counter, turn your phone off, then hold volume down, the home button and power button all at the same time until the screen comes on with the yellow triangle, then push volume up once.