I know this is a known bug, but on the normal servers I've never run into it how I just did on the test server.

Three levels in a row (was playing through Time Enough At Last, if it matters) in SF had kats being placed up above the walls nearly every time that they were near them.
It happened repeatedly, especially while moving through the corridors.

I've seen it very rarely on the normal servers with different monters, but this time it was happening left and right, pretty well through the whole of the levels...