AEM 6.5.14 Icon not showing only in HTTPS Author instance

Hello everyone,

My AEM author instance doesn't show the icon on the starter page and also on the content page if i open it in Https.

if you look at the console it says "failed to decoded downloaded font" but if i open the font url directly it still downloads the font.

and this only happens on Https in author instance (for http the icon shows), for publishers it runs normally (the image below is the publisher with https).

in addition I use nginx as a https reverse proxy.

I have "Invalidate Caches", "Rebuild Libraries" and "Clear ClassLoader" but the icon still doesn't show.
I've also tried to re-install the service pack but it still the same.

thanks.