In K2 v2.10.2 the page title and meta tags have been "normalized" to display in a consistent way.

The "page heading" specifically is meant to override the actual heading by the component. So if you're in a category, it should override the category title (if it's set of course). Same goes for every other view.

If you wish to override that behaviour and do something else, you can always slightly modify your K2 template overrides.