Question about Logitech G G512

Is it possible that the key assignment on the Logitech 512 is incorrect? In my case, the "(" is on key 8, but we write on the shift 7 key. Another example is the "?", which is on the key I use to write "-". It should actually be next to the right shift key, but it is the return key. There are many other examples such as the "ö", "ä" and "ü" which are written on the keyboard but are not on it as characters. I can write them using the keys with the ";", " " " and "[" symbols. What is the standard of the keyboard that the mapping is so strange?