Sorry for my poor english
if u see my attached screenshot, it shows I currently maintain 5 spells.
Inner Calm, Stance: Coiling Serpent, Tranquil Vision, Clam Tranquility and Storm Stance.
Sometimes after few zoning, some spells icon will disappear in the maintain bar. for instant, Storm Stance and Clam Tranquility gone in maintain bar.
While I check my toon's stats and check the effect bar it both showing I still maintaining the spells, that meant the spells currently running but just the graphic icon on the maintain bar gone.
This issue happens alot if you zone alot.
this problem can be solve temporary by relog your character but after some massive amount of zoning, the bug will came back.
( and yes, "thanks for fixing it" I forgot "in advance" hehe)