You have to create new grids for each NPC path. If you use the same grid ID on multiple NPCs, they will be on the same pathing. Remove their existing grid ID and create a new one then assign WPs to the new grid for that NPC. When you create a new grid, make sure it is a grid ID that isn't already in use for that zone. You can check the max grid in the current zone using the command mentioned in the previous post. Just set the new one(s) to be higher than the current max. Also, adding a grid only adds a new grid, it doesn't assign it to any NPCs, you have to do that separately. You might want to just simplify the process by removing their current grid and using the #wpadd command which combines the grid add, grid assign and wp add commands all into a single command.
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