Code for favicon appearing on every site page

Hello,

On the website : https://www.ac-bioscience.com

there is a code appearing on every pages : " rel="icon" type="image/vnd.microsoft.icon">

As now only png are accepted by Gridbox I thought it was because the old .ico file I used, but after uploading the new 512x512 .png file nothing changed.

Can you tell me what would be the problem ?

Thank you for your help.

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