When saved, the double and single quotes in the css get parsed into htmlentities, corrupting the css.
Quotation marks are needed in css for file paths (url property) and font names which have spaces.

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murraybiscuit’s picture

murraybiscuit CreditAttribution: murraybiscuit commented
Title: Quotation marks » Quotation marks being converted to html entities

This happened after moving from one host to a shared host.
The files generated weren't being overwritten when I tried to change the css due to permissions.
It worked again when i recreated the rules after deleting the generated files.
That fixed it, but still doesn't explain why the quotation marks were escaped in the first place.