For the Finale map, I place archers on the ballista platforms. Ogres tend to indefinitely run in place against the side of the platform while on the stairs in a vain attempt to get them.
I forgot about this, but mine did this too. Though I fail to see a problem. Put a spicy mushroom down and move on.
It's not a problem for us players. The developers might like to know so they can fix bugs.
Same happens with the hunters chasing archers on Hard Climb and Triple Down (DLC). I've never seen the ogres there on Finale, but that might be because I tend to shoot them before they can get there ;)