Rows of data are repeated until the spreadsheet rows reach a maximum limit. Happens when paste is performed via right click on column header. Actions taken: Select and Copy grid data of Column C. Click on Column A grid cell. Right click on Column A header, select 'insert columns before' . Bug = Right click and paste while still on Column A header. Result = Copied grid data is repeated to the end of file size. Workaround = Right click and Paste the date to a grid Cell, works. Result = only one iteration of the copied data.
*** This bug has been marked as a duplicate of bug 150239 ***