You either have far too many far too close together, the limit is; only 4 shadow lights can be rendered at once.
Or you have shadows turned off in the View -> Show/Hide menu.
Also, if you don't mind some level design advice, that is an empty section of hallway with a rather flat wall, so putting a shadow light there is kind of a waste. You are fairly limited with how many you can use, so save them for places where they draw attention and really just look great. Places where the light/shadow contrast looks good, or the sillouette of shadow casting objects looks good. Something like a flat-ish hallway wall isn't ideal.
