External link in image hover not wotking

When creating a new image I enter an external link description eg https://www.youarehere.com but when clicking on the image to follow the link it goes to https://ikamu.co.za/gauteng-north/www.youarehere.com/
How do you change this so that the https://ikamu.co.za/gauteng-north/ does not form part of the link.

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