Circle turns to a Square in published Site! Why?

Hi Guys,

Im going crazy with an on mouse move circle hovering the burger menu.
IT WORKS PERFECTLY ON DESIGN MODE , but on the published site it shows as a blurry Square!
Can anyone please help with this?
See pictures below!
Thanks

Vince
Screenshot 2020-08-18 at 13.19.03 Screenshot 2020-08-18 at 13.19.12 Screenshot 2020-08-18 at 13.19.30


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