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In OmniOutliner, more specific styles override more general ones. If you set the "All first level rows" style, for example, it'll override the "Whole Document" one. Ditto if you select a specific row and apply a style to it.

If you open up the styles view (under the view menu) you can see what things have styles applied to them by looking at which style chits are empty and which aren't. That'll help you figure out what's going on here.