Rogue Exile Atlas nodes - Turning off Rogue Exile spawns?

Hi there,

I have noticed that since I have taken the Rogue Exile nodes on the atlas, that they have not spawned in any map. I've done between 30 and 40 maps today, and have not seen one at all.

Not sure if this is a bug or bad luck, but it seemed too coincidental.

Thanks for your time,
-B

Update: Just had one spawn.

The rate does seem terribly low, though. :\