Spreadsheet - Strange Content

[Thomas_Sch]

There is another possible reason for the weird contents:
The data could be entered & stored to the complete row!
If you select for example the row 2, and enter something ("test"), this will be stored to all (empty) cells in row 2.
To delete this entries, select row 2, and press backspace.
Individual contents of single cells is still remaining, but "global" contents of the row will be erased.