System Update installed, but keeps telling me to restart and install

I am on the latest version as far as I can tell (LMY48I - VERIZON), but I keep getting the message to restart and install. It doesn't work because I have gone back to being rooted. Besides, I am already on the latest version. I went to all the trouble of un-rooting and stock, updated, re-rooted (twice) but the message keeps coming back. Anyone else?