It might be.
Now I discovered that “add to cart” button has the same problem and it just keeps loading.
And it seems to me, that IE is only browser that reads IDN (https://en.wikipedia.org/wiki/Internationalized_domain_name), others show unice(punycode) address.
My domain name in native language is https://sülearvutiaku.eu and when hovering add to cart IE shows it like that, Firefox and others show https://xn--slearvutiaku-dlb.eu.
Is there a way to tell IE not to use IDN?
If not the only solution seems to be to register sulearvutiaku.eu also.