name of city: Holmgard
As you can see on this first picture my oil thingys are not on the gatehouse, also the gatehouse is impassable to walk up on as well as the 2 towers nearby.
I can however use the gatehouse to walk in and out of my keep so no problems there.
The area within the red border is impassable
Both these problems are on the outer-wall, both problems came up when i upgraded my gatehouses i think, cus they worked at the start.
first SS are on the far East side of wall, the other 2 are from the far west side.