Why is my url file on VPS change?

I using CentOS 6, and I have some problem,

Why is my url file on VPS change?

For example:

It’s change:

When I update new file index.css, the older file do not change.


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Pagespeed adds a random string to each compiled file. <strong></strong> won’t change but a new “optimized” file will be created with a different name.