S
Squid
The hall lighting control is using an impulse relay in the loft controlled by the four one way/single pole push for on switches. Every time the push is pressed it creates an impulse ie off -on-off which an impulse relay in the loft uses t0 'toggle' between on and off or off and on. The impulse relay then controls the two hall lamps.
Call Einstein in to fix it.
Fixed that for you........