Lost & Found

So i attempted this 3 times today. on the last attempt I got all 3 hints with 2 other people. I stood right above the ??? and it would only come up for 1 second then disapear showing i was 1 yalms away to 0 yalms away had npc right above where i saw the ??? 5 times and it would come up at weird times and only briefly. Has anyone gotten this before on this assault mission? Some bull!!!