Themes brake when is used HTTPS on IE11

Hello,

I have an issue related to VAADIN/themes static content.
The issue happens on Internet Explorer 11, when is used https (it works fine when is used http).

Steps to reproduce:

  • load a page;
  • press F5 or Refresh button.

Efects:

  • When the page is loaded for the first time, everything works fine;
  • When the page is refreshed, the text has a different style. Also, other elements like down arrows and gliph icons dissapear.

Everything works fine on Chrome.

Looking forward for feedback,
Thank you!