Why does Application Cache cache php scripts?

Question

caching

I read everything I could get my hands on about Appcache. Set up, registered, measured the difference - cool!
But then I noticed that Chrome began to cache all the php scripts that I saw on my way. As a result, instead of the prescribed static resources, we have a list in the whole screen, where half of them are php scripts and are called Master.
Why is he doing this?
The manifest has the following structure:

CACHE MANIFEST

CACHE:
img/logo.png
css/global.css
js/jquery.js

NETWORK:
*

What's wrong?