I have attached a style sheet and referenced said style sheet in my html macro, everything looks as it should when I preview, however after saving, the changes do not show. Is this a bug in Confluence 3.5.3 (version I am using)?
Probably not - the html macros are rendered in the body, long after the header, and hence css, is loaded.
You might want to guve us a bit more detail on how you've coded the macro, but I suspect the full answer is going to be that you need to put the css in the space rather than the macro, and 3.5 is too old to be supported anyway.
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