Problem when leaving groups, players still spawn in same map

Some times when I leave a group, the other players still spawn in the same map as me even though it's a dungeon/boss room
In the picture, i leave group after killing Herald (Hard) for event and the other members spawn in the same map(Hidden Sanctum) as me
How can I resolve this? Or is it a bug?

 

There is one rule I am using just to avoid what you have described.
1. If a player from a group goes offline while on map ... dismantle the group (in town) and create another one ... because you will always get empty map because of the offline player occupying that instance.
2. If you leave the group make sure you visit the town or change the map before start playing the same map.
3. Always teleport to town before leaving the group.

OK not one ... as set of rules.

 

Thank you for the advice, I will start doing that

 

Good to know. I've had this happen during the last DoE event, and one guy thus ruined a portal for each of the other 4 people in the group, myself included.

 

Meganuker's fix.

If someone dc'd while you where in a map kick them and do this.

All but two people leave the map.
1 Kick one of the players. They will get a new map.
2 Invite them to group.
3 Warp to town and once there everyone will spawn into the new map

 

The problem of disconnects is happening more frequently. Repeating massive lag spikes are simply unplayable.
The regrouping workaround takes time. It's easier to quit, and come back later.