i doubt theres really anything that can/will be done about this but this is more to show that there is certainly an issue with PV atm.
if you have problems your supposed to relog and problems fixed.
this is from before the relog (no npc's to even start the quests lol)

and this is after i relogged and entered again

i never have had this issue before. probably just due to so many running pv or something idk but yea there is problems with it atm :<
any ideas for a fix would be appreciated. thx in advance :3
*update* i logged in a second 135+ toon and sent it into pv then invited the toon i was having issues on.
i actiavted the mobs with both of them inside passed lead and left on the new toon. after completing the instance i had the second toon enter pv again and invite and this worked for me.
ok on the second run of using this method this was the result xD.

no mobs or boss was in the big room when i got there lol.
anyway i give up on leveling alts but there is something wrong with pv atm and here some proof xD