serius bump mapping problem

One object. Over 20 shaders applied to faces. Each shader a projection.
I start painting bump textures to put in some shaders (using the same projection).
All seems to be OK. I select in hardware texturing the bump map, so in viewports all is ok, the map is where i want. The uvcentric is ok too.
Then, when render, the bump map is not in the place where it should be and strange artifacts appear.
I send some images where i put a cheker texture in the bump chanel. Again, all is correct, but the render, see it.

Note: I have made a new projection only for the bump map but the result is the same.

Have you tried to subdivide the surface?