I am using ASP.NET MVC to develop a site. The CSS file has grown to 88KB and is having a little more 5,000 lines. I noticed recently that styles added at the end are not the
Have you validated your CSS? Some browsers will include styles up to the point of a syntax error (or certain syntax errors) and then effectively truncate the file for you, leading to just this behavior.
I'd also vote for refactoring your CSS, you can probably get away with a bit less . . .