I can't type Diacritics

Hello! I have been having this problem for a while and Since I didn't want to bother any Mods, I just tried to google my problem. There is no Solution and I really want Help. I am Using a Czech Keyboard and I am in a Czech Guild. ALL of them can use the diacritics letters well and I can see them but when I use them they turned out to look like ... Some Mutant ... I have no Idea what to do, my keyboard language is Right and they look if I may say ,,Deformed" Simply can't use Diacritics. Please help me :c