Maintenance for the week of October 5:
• [COMPLETE] ESO Store and Account System for maintenance – October 8, 8:00AM EDT (12:00 UTC) – 12:00PM EDT (16:00 UTC)
Maybe a UI issue, I have had that happen with TFC sometimes. It will say incorrect stats, tell me I'm still at the previous level or in the previous zone, etc.
I bet you're correct, but if thats the case I'd like to see the API response time vs the server to client response time and see why they two are out of sync.
My comrades have returned. I erect the spine of gratitude. You are a hero today. - Bura-Natoo
The health bar desyncs sometimes for me as well. Mostly, it gets stuck at around 90% or so and never refills completely unless I relog. This is like the opposite effect (your bar shows more HP than the server thinks you have left), but it's probably still a desync issue. This is an error that has cropped up from time to time since release for me.
My guess would be it's the addon.
had this as well with various custom health bars but never with the original interface
I do not use any health addon either and it never happen to me. My guess it is the addon's problem -- try to play ESO for a while with out* that addon and see if it still happens.
*Completely delete from your HD, not just disable it on the UI screen.