Oil Leak

I have signs of nice clean engine oil sitting on the top of the engine right underneath the variator above the oil filler cap. Is this prone to leaking and what might the symptoms be other than oil leaking? I've tried to tighten the two torx screws but these already seem very tight.

Thanks!

They do weep sometimes, it's nothing seriuos and an easy one to resolve, with the engine off and cold remove the 2x T30 screws, clean the square rubber ring under the top plate and smear a thin layer of sealant on it before refitting, that should stop it happening again.

Thanks Joe, much appreciated mate!