Rotax 912 ULS - 350 hours

In a last few days I started noticing quite a bit of water condensation on my oil tank cap.

Attached is a picture of how much water was there after only about 15 minutes engine run on the ground ( including full run-up)

Is it possible that the to oil breather tube is somehow blocked or should I look for some other culprit ?
oilcap.jpg (You do not have access to download this file.)
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