I thought this was my fault for about 2 weeks until I found a solution tonight. Because I spawn too many entities in the game at once with nodes and path entities. That was my clue to the solution. This will fix the problem. You are welcome to experiment with the bloodsplats and bullet holes setting but the shell casings is the main problem.
Instructions are now in the docs.
Please consider the route file format to be stable until further notice. You are probably setting maxclients to 8 in your server config file or on the commandline. Just change it to a higher number.