Icons validation errors

Hello,
I generated the favicons using realfavicongenerator.net, but when I check them I get some errors for classic desktop browser:
? favicon.ico is available in the root of your web site
? There is an icon for classic browsers
? favicon.ico is present
? favicon.ico contains the highest resolution icon (48×48)
? Image https://maciej.rzeszutko.net/favicon.ico is ill-formed
? https://maciej.rzeszutko.net/wp-content/uploads/fbrfg/favicon.ico?v=476ONANKe7 and https://maciej.rzeszutko.net/favicon.ico both exist and are different
? favicon.ico is missing some icons of recommended sizes (16×16, 32×32, 48×48)
BR,
Maciej

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