Every time when I open the site it to scroll down. About 1500 pixels down. The most interesting - I have not changed anything and before this problem was not.
MODx Evo 1.0.5
This, in your source code:
...checks whether the document has a form with id "loginfrm" in it, and if so gives the "username" field focus. (Let the page load and start typing; you'll see the User field getting field out.) Since you seem unaware this even existed, I can only guess some plugin or CMS function is injecting it automatically. You'll have to determine how to remove it.