/clone with the wrong region

I created a chain conditional command block at (1049,66,1089) in my world.
The command block tries to execute the following command:
/clone ~-1 ~ ~-27 ~1 ~4 ~-27 ~-32 ~15 ~-13 replace normal
which clone the blocks within (1048,66,1062) and (1050,70,1062) to (1017, 81,1076).
If the command block executes correctly, the output would be "1" in the destination region.
However, the destination region displays a '7' which is located at (1056,66,1067).
When I tried to replace the '7' into '1', the destination region displays correctly.
I have tried to replace the relative coordinates into absolute coordinates, the problem still exist.

**Attached with some screenshots and the world.