Debuff after zoning?

[NPC]

I was fighting near the zone line in Najena, I had just got buffed by a druid, had 8-9 buffs on me. I zone out of Najena into Lavastorm while getting beat on, I did not die, an all my buffs that were casting on me 5 mins ago poofed. Even my personal buffs. This happened again to my personal buffs. My personal buffs were on me for like 1-2 mins an I zoned while getting beat on an they poofed?!? Wtf?