Zakra Theme does not update changes in Firefox Browser or Internet Explorer

Dear Zakra Theme Team,

For whatever reasons the Theme does not update the changes that I made in Google Chrome browser in Firefox or Internet Explorer. I deleted all cookies and the cache in internet explorer as well as firefox however the changes on the website that I can see in Google chrome browser are not the same way visible in internet explorer or firefox.

I can also see the changes on Safari browser of apple.

Thanks a lot in advance for your help!

Kind regards

Markus