Chipro, your fontawesome looks like it is using https, but you may have to check where foobox font is being loaded.
I temporarily fixed my issues by removing the “..” from the css files and replacing it with the full website URL with https. If you do this, hummingbird won’t have to guess what to replace the “..” with. However, this could break when updating themes and plugins.
Hummingbird should still fix this though. I cannot find where in the code it does this replacement, so I can’t troubleshoot any further.