How can I use "fill series" without appearance of unwanted commas?

Question

before:

V 2013

I am using fill series to fill cells below.

expected:

V 2013
V 2013
V 2013

result:

V 2013
V 2,013
V 2,013

I found only http://productforums.google.com/forum/#!topic/docs/kv1kDdzoYOY - without any useful information.

Answer 1

Use the keyboard shortcut for Fill Down: ctrl+D. Make sure to highlight the range you want to fill beforehand. You can either use shift+click with the mouse, or shift+down with keyboard to highlight the range.

This seems like a bug in Google Spreadsheets. I was able to replicate when using mouse to drag the bottom right corner, but ctrl+D works fine.