So I've finally been introduced to raids for the first time (Crystal Tower series). When I ran it the first few times, I've noticed that there were environmental markers telling the players where they had to go for specific tasks depending on which team they are part of (like team A in LotA should go to the left and step on their panel to drop the shield around the enemy for team B).

I re-ran it today with someone who had never done it before and told them to just pay attention to the symbol when it pops up, since it usually means a mechanic we have to split up for. I was surprised to find that the floating letter symbols just weren't there anymore. Or they would flicker and disappear after a moment. Are these letter symbols not automatically generated by the map, but rather by the players setting a mark? Was it just glitching out?