I assume this is "normal" as it happens on all of my family's accounts, but whenever we go into a house, life and stamina bars empty. What is that about?
I have noticed a pattern of health bars dropping upon zoning. I can watch my Necromancer's health drop and refill every so many seconds just sitting around in the zone. I swear it has something to do with the auto regen...
I am assuming you are on lore and legend server. Your health is not going down it is actually going up. You are auto mentored so in town you are lvl 10. When you go into a house or guild hall you auto mentor up to lvl 90, but your actual amount of health and power is still at lvl 10. You don't notice when you zone back to town because your health and power are still maxed out.
I've fast traveled to Qeynos from other zones. Sometimes my character arrives with full health, sometimes half health. Not in Legend and Lore. I've been in The Commonlands, and just used the housing tab on character window, and the same thing can happen.
This is my life bar when I go into my Kelethin starter home. As one of the reasons I go home is to make something, it is very inconvenient to have to twiddle my thumbs waiting for these bars to restore before I can start manufacturing. Whatever reason it is doing this, it would be nice if it was fixed! Okay, sorry, I cant just paste an image here...but the Life and Power(?) are a barely noticeable presence. Ok, I worked out how to do it!
Happened to me again. I went from the Qeynos portal into Prestige, went in, and my character's health bar was about 2/3rds of what it should be. Took about 30 seconds for full health to come back up. Health bar was yellow to start.
I don't think they intended to do whatever it is the lore and legend server does about jumping the levels automatically. Since they added that feature, it needs a rework to check and fill health on zoning.
Did it again, going from 19 to 20 crafting level, Frostfang Sea NPC. Green health, bam, yellow health. on Maj'Dul.
