CSS is stupidly wrong

Ok in my FTP theres a CSS file called style.css, if I look into this file it states at the top “v1.1 Shauns theme”.

This is also true when changing the theme in the appearance panel I have a few themes I’ve been testing out – and mine is listed there as “v1.1 Shauns theme”.

I click “yes – I want this template”.
I go to the editor in WordPress – my css file is there, it has all the correct stuff in it.

I navigate to my site, view the source – its the wrong bloody css file!!
Its magically remembered an earlier version of the css – that as far as I know – is no longer physically located in the site at all.

Please help me – I feel like I’m going mad. It’s illogical ??