Players Spawning Outside Arena

When i set the spawn points to the edges of the arena ( I am using the recommended arena prefab ) players are spawning outside of the arena. It seems to be putting a sphere around the arena for potential spawn points but the arena prefab recommended for this is not perfectly round. Any pointers on how to set this up ? I could set it to one side since each end of the prefab are round but that would kind of defeat the purpose of half the arena and would make the players spawn very closely.

Thank You

hey, of course. Sorry for the inconvenience, in the last update I didn't think about it thoroughly. Please give me some time to provide a fix for that. 

In the meantime, You can set the arena in literally a random place, it will work too (the sphere protects the area) - so You can enjoy the plugin in this wipe without waiting for the fix.