Problems with hyphens

I have in some of my url hyphens.
Under preferences, for "Space", I entered a hyphen, so that all spaces will be replaced by a hyphen. This happens. However, all existing hyphens are displayed as %11.

example: before: www.mysite.com/just-a text
after: www.mysite.com/just%11a-text

Is there a way to modify the settings so that all existing hyphens show as hyphens, and all spaces are replaced by hyphens?

No because if regular hyphens in titles wouldn't be encoded then they would be treated as spaces, there would be no way to make a distinction.

You can replace hyphens to something else, like underscore (-=>_) but make sure you have no underscores in any titles then.

Thank you for the tipp - solved my problem as well. 
Emptying the cache may be needed, not to end up on a invalid page after changing to a new character.  :