I guess it is an anglicisation of the word, czech spelling and grammar are not so widely known outside Czech Republic. I have seen similar quirks going from En

I guess it is an anglicisation of the word, czech spelling and grammar are not so widely known outside Czech Republic. I have seen similar quirks going from English into Czech. Like how there is "sendvič" for sandwich, and "sendviče" for sandwiches ... I've seen some places here advertising "sandwiche" (applying the Czech plural to the English stem).