Today I tried to change some styles of the javascript language, because it bugs me to hell, that null and undefined are not colored as keywords. I did this once in the past and it worked fine for me. During an update of Notepad++ lately, the styles were reset. Since the decoloration of the two terms annoyed me again, I decided to add the keywords again to the list. This does not works. In the style configurator, Javascript is listed twice:

The problem I have now is, that changes to the new definition (first image) are saved in the old one (second image), but when displaying a file, then the new one is used for styling. In the language drop down menu, Javascript is listed only once.

Is there a way I can easily reset all styles to default? I have made only a few changes, so resetting is fine for me.