I guess you changed only the decimal separator to "," and the thousands separator is now the same with the decimal separator, which is not a bug, is a mistake. If you use "," as a decimal separator, and "." as thousands separator, in formatting the cell select 2 decimal places and check the option "Use 1000 separator (.)" , the entry 1441,75 will be displayed as 1.441,75.
If you keep "," as decimal AND thousands separator, AND you check the option "Use 1000 separator (,)" (notice that the option now has comma in the paranthesis), excel is confused, will consider that your entry is an integer with no decimals, because of using the comma as the 1000 AND (!!) decimals separator , thats why it shows ",00" to display the decimals......
As for switching between columns, there is no such concept in excel, as far as i know. Use VBA or do it manually.