Bots spawning beneath terrain at military tunnels

My configured Botspawn NPC scientists at Military Tunnels, the ones external to the tunnel that roam around outside, seem to spawn beneath the terrain and fire at players from underground. I had a player report this behavior to me and went and observed it with him. I have 6 configured bots that are supposed to be outside miltuns, and until recently, they've behaved normally. Now, I only ever see 1 or 2 and the rest are below the terrain. If you get near the invisible ones, you start getting shot from underneath, and you might see the top of a head sticking up through the ground, then they eventually pop up and become visible as the engagement continues. Any reports of this behavior from others or ideas as to why it may be happening?

Changed Status from Pending to No Response