Shimano grx brake leaking

Hi tried to see if there was a thread about the shimano grx front break leaking at the "master cylinder / resivour ". So sorry in advance if I asking questions that have previously been answered. I recently purchased a new bike in December and to jump right to my problem. This is that it is weeping mineral oil from around the resivour seal is this normal?
Or what can I do to stop it leaking?
Would post a picture but not sure how to.
Thanks in advance for any advice.

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