Writer inserts a '1#' to all but the first cell, when you copy multiple cells
from a writer table and then 'paste spezial as unformatted text' to a cell range.

to reproduce try the following:
- Open a new Writer Document
- Insert table (e.g. 3x2)
- put some data in the first columns's cells (e.g 1,2,3)
- Select first column (so that all cells are highlighted)
- copy to clipboard
- Select 2nd column (so that all cells are highlighted)
- 'paste special' as unformatted Text 

as result, the first cell will have the expected content (all: 1,2,3). All other
cells will have a "1#" (Windows) or "1##2##3##" (linux).