Have you never seen that before?! Grins. Yeah, it's absolutely fine, it's just paint separation and is completely normal. Stir and good to go as you say.
Its not a thixotropic paint so i doubt very much is says do not stir on the tin, stirring is essential with most paints as they separate in the tin as yours has done. Stir it well and you'll be ok to use straight away.
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