Thanks for a reply. I disabled the extension behind #038;, now it looks like this:
https://fonts.googleapis.com/css?family=Open+Sans%3A300italic%2C400italic%2C600italic%2C300%2C400%2C600%7CNunito:200,200italic,300,300italic,regular,italic,600,600italic,700,700italic,800,800italic,900,900italic%7COpen+Sans:300,300italic,regular,italic,600,600italic,700,700italic,800,800italic
Unfortunately the issue persists, characters like š,ř,ž have different style (font) than the rest of the text. Any other idea?