[Leica] Leica CM meter question

[barnikos at panafonet.gr (Nikos Bartsotas)]

Hello everyone.

I would like to ask for your help in a little "problem" I have:
Recently I added a CM to my equipment, and generally it works fine. The only 
thing I cannot understand is this:

Having chosen either "P" or 2.4 as aperture, I cannot have shutter speeds 
slower than 1". When the scene is dark, the exposure meter gives me speeds 
until 1", and then only "888" (which stand for very slow speeds, greater 
than 30sec). 

First, I would like to make clear that by "dark scenes" I don't mean the 
wall of my house in darkness, which might trick the exposure meter, because 
of the lack of contrast. I mean photographing city lights from distance at 
night. In this setting for example, my SLR's meter gives me 2.8 aperture and 
2'' shutter speed at 200 ISO. When I point the CM at the same scene, using 
the same film speed, and press the shutter button half down, I get 2.4 
aperture and 888 for time, which should be for shutter speeds greater than 
30sec, right? I don't get the expexted 1'' or something around it.

And, generally, late in the afternoon or early in the night, either I get 
2.4 with 1/2 shutter speed, or if i try to meter a sliiiightly darker scene, 
I get 2.4 with 888 (instead of the logic 2.4 with 1'', or 2.4 with 2'' you 
would expect).

I'm just missing pairs between 2.4-1/2 and 2.4/888. 

Is this logical to happen?
Please give me your opinion.

Thanks on advance,
Nikos