Thanks for the report - in this case, it's because Sublime Text ranks scope selectors in a slightly different way to TextMate.
There are two rules in question (named "Meta.tag.inline" and "css tag-name" in the .tmTheme), with the selectors (relevant part only):
A) source entity.name.tag
Against the scope "source.css meta.selector.css entity.name.tag.css", TextMate will rank B higher, while Sublime Text will rank A higher.
I'd like to fix this, but it's not high on the priority list - I'm not aware of it having caused any other issues. In the mean time, you should be able to work around it by tweaking the selectors in question (perhaps by getting rid of the source prefix on the first one, or adding a source.css prefix to the second one)