Wamp favicon on php pages saved in xamp htdocs directory [Closed]

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Hello,
In this case I am really confused, I am running xampp and working with php files in xampp server htdocs directory, although I have the wamp server favicon instead of xampp favicon on the top of the pages knowing that wamp is not running, at least I havn't run it at all.
Is there any explanation to this ?
Thank you