Health bug?
We did a visual change that makes it look like you have less armor (green pips), but it basically just halved the pips you have. Reason we did this was at higher health levels you'd have so many pips that it got a little hard to see just how many you had.
Note that there is also a bug the team is trying to identify where the amount of pips you have does indeed change. They're still investigating if this is just visual, or if actual armor values are changing.