How to replace copy-paste picture without changing other text location?

Hi

I have a problem with editing my existing LibreOffice Writer files - when I want to change the picture (deleting existing picture and copy paste another) inside the text, then the text spacing decreases, but after pasting another picture the text location remains the same. How can I copy-paste another picture without changing text location? - http://screencast.com/t/IBOoRes9

I have LibreOffice Writer Version: 4.3.1.2, language english. And my OS is Windows 8.1 64-bit, english.

Thanks for any help.

Anyone have some ideas?